| Tuesday 1 January - Monday 14 January 2008 | | West Virginia State Presidential Convention Delegates Selected |
| Thursday 3 January 2008 | *Iowa Caucus1 | *Iowa Caucus |
| Saturday 5 January 2008 | | *Wyoming County Conventions |
| Tuesday 8 January 2008 | *New Hampshire Primary1 | *New Hampshire Primary |
| Tuesday 15 January 2008 | *Michigan Primary1 | *Michigan Primary |
| Saturday 19 January 2008 | *Nevada Precinct Caucuses1 | *Nevada Precinct Caucus
*South Carolina Primary |
| Tuesday 22 January 2008 | | Louisiana District Caucuses |
| Friday 25 January - Thursday 7 February 2008 | | Hawaii Precinct Caucuses |
| Saturday 26 January 2008 | *South Carolina Party-run Primary1 | |
| Tuesday 29 January 2008 | *Florida Primary1 | *Florida Primary |
| Friday 1 February - Sunday 3 February 2008 | | *Maine Municipal Caucuses |
| Tuesday 5 February 2008 | *Alaska Precinct / House District Caucuses1
*Alabama Primary1
*Arkansas Primary1
*American Samoa Territorial Caucus1
*Arizona Primary1
*California Primary1
*Colorado Precinct Caucus1
*Connecticut Primary1
*Delaware Primary1
*Georgia Primary1
*Idaho County Caucus1
*Illinois Primary1
*Kansas Local Unit Conventions1
*Massachusetts Primary1
*Minnesota Precinct Caucuses1
*Missouri Primary1
*North Dakota Precinct Caucuses1
*New Jersey Primary1
*New Mexico Party-run Primary1
*New York Primary1
*Oklahoma Primary1
*Tennessee Primary1
*Utah Primary1 | *Alabama Primary
*Arkansas Primary
*Arizona Primary
*California Primary
*Colorado Precinct Caucuses
*Connecticut Primary
*Delaware Primary
*Georgia Primary
*Illinois Primary
*Massachusetts Primary
*Minnesota Precinct Caucuses / non-binding straw poll
*Missouri Primary
*Montana Caucus
*North Dakota Caucus
*New Jersey Primary
*New York Primary
*Oklahoma Primary
*Tennessee Primary
*Utah Primary
*West Virginia State Presidential Convention |
| Tuesday 5 February - Saturday 9 February 2008 | | *Alaska District Conventions
Northern Marianas Precinct Caucuses |
| Tuesday 5 February - Tuesday 12 February 2008 | *Democrats Abroad Local Caucuses / Primary1 | |
| Thursday 7 February 2008 | | Michigan County Conventions |
| Saturday 9 February 2008 | *Louisiana Primary1
*Nebraska Precinct Caucus1
*Virgin Islands Territorial Convention1
*Washington Precinct Caucuses1 | *Kansas Caucuses
*Louisiana Primary
*Washington Precinct Caucuses |
| Sunday 10 February 2008 | *Maine Municipal Caucuses1 | |
| Tuesday 12 February 2008 | *District of Columbia Primary1
*Maryland Primary1
*Virginia Primary1 | *District of Columbia Primary
*Maryland Primary
*Virginia Primary |
| Friday 15 February - Saturday 16 February 2008 | | Michigan Congressional Caucuses / State Convention |
| Saturday 16 February 2008 | | Georgia Precinct Mass Meetings
Louisiana State Convention |
| Tuesday 19 February 2008 | *Hawaii Precinct Caucus1
Washington Non-binding primary
*Wisconsin Primary1 | *Washington Primary
*Wisconsin Primary |
| Tuesday 19 February - Friday 14 March 2008 | North Dakota Legislative District Conventions | |
| Wednesday 20 February - Monday 17 March 2008 | Colorado County Assemblies and Conventions | |
| Friday 22 February - Saturday 15 March 2008 | | Minnesota BPOU Conventions |
| Saturday 23 February 2008 | Mississippi Precinct Meetings
Nevada County Conventions
Oklahoma State Convention
South Carolina Precinct Meetings | *American Samoa Territorial Caucus
*Northern Marianas Commonwealth Convention |
| Sunday 24 February 2008 | | *Puerto Rico Territorial Caucus |
| March - April 2008 (tentative date) | | Virginia Local Mass Meetings, Party Canvasses, Conventions |
| Saturday 1 March 2008 | Alabama State Democratic Executive Committee Meeting | *Tennessee State Executive Committee |
| Tuesday 4 March 2008 | *Ohio Primary1
*Rhode Island Primary1
*Texas Primary1
*Vermont Primary1 | *Ohio Primary
*Rhode Island Primary
*Texas Primary
*Vermont Primary |
| Saturday 8 March 2008 | *Arkansas Special State Convention
Arizona Regional Caucuses
*Wyoming County Caucuses1 | *Guam Territorial Caucus
Iowa County Conventions
Puerto Rico Territorial Convention |
| Monday 10 March - Monday 7 April 2008 | | Delaware Delegate Selection Meetings |
| Tuesday 11 March 2008 | *Mississippi Primary1 | *Mississippi Primary |
| Thursday 13 March - Saturday 15 March 2008 | | *Alaska Convention |
| Saturday 15 March 2008 | Iowa County Conventions
Mississippi County Conventions
Tennessee State Executive Committee | Georgia County Conventions / Precinct Mass Meetings
Nevada County Conventions |
| Saturday 15 March - Friday 11 April 2008 | *Democrats Abroad Regional Caucuses | |
| Wednesday 19 March 2008 | Connecticut Post Primary Caucus | |
| Saturday 22 March - Saturday 3 May 2008 (tentative date) | | Washington County Conventions |
| Wednesday 26 March 2008 | Connecticut State Central Committee | |
| Friday 28 March - Sunday 30 March 2008 | | North Dakota State Convention |
| Saturday 29 March 2008 | Texas County and Senate District Conventions | |
| Saturday 29 March - Saturday 19 April 2008 | | *Minnesota District Conventions |
| Thursday 3 April 2008 | *District of Columbia State Party Committee | |
| Friday 4 April - Sunday 6 April 2008 | North Dakota State Convention | |
| Saturday 5 April 2008 | Delaware State Convention
Florida Florida Democratic Party State Executive Committee
*Missouri State Committee
Washington Legislative District Caucuses | *Virgin Islands Territorial Caucus |
| Saturday 5 April - Saturday 19 April 2008 (tentative date) | | Arizona District and Country Conventions |
| Saturday 5 April - Saturday 26 April 2008 | | North Carolina District Conventions |
| Saturday 5 April - Saturday 3 May 2008 | Mississippi Congressional District Conventions | |
| Sunday 6 April 2008 | Wisconsin County Caucuses | |
| Saturday 12 April 2008 | *Democrats Abroad Global Convention
Kansas District Conventions | |
| Thursday 17 April 2008 | New Jersey State Committee | |
| Saturday 19 April 2008 | Arizona State Convention
Michigan District Conventions
New Mexico District Conventions
Washington County Conventions and Legislative District Caucuses | Georgia District Conventions
Iowa District Statutory Caucus |
| Tuesday 22 April 2008 | *Pennsylvania Primary1 | *Pennsylvania Primary |
| Friday 25 April - Saturday 17 May 2008 (tentative date) | | Colorado County Assemblies |
| Saturday 26 April 2008 | *Iowa District Conventions
New Hampshire Caucus / National Convention Delegation Meeting
New Mexico State Central Committee | *Nevada District Meetings and State Convention |
| Thursday 1 May 2008 | *Maryland State Democratic Central Committee Meeting
New York State Committee | |
| Friday 2 May - Saturday 3 May 2008 | | Delaware State Convention |
| Saturday 3 May 2008 | *Guam Territorial Caucus (Party run primary)1
Louisiana State Convention
South Carolina State Convention | Arkansas Special District Convention
*Maine District Caucuses and State Convention |
| Saturday 3 May - Friday 16 May 2008 | *Colorado District Conventions | |
| Sunday 4 May 2008 | Wisconsin Congressional District Caucuses | |
| Monday 5 May 2008 | Illinois National Convention delegation meeting | |
| Tuesday 6 May 2008 | *Indiana Primary1
*North Carolina Primary1 | *Indiana Primary
*North Carolina Primary |
| Friday 9 May - Saturday 10 May 2008 | Utah State Convention | Mississippi State Convention |
| Friday 9 May - Saturday 24 May 2008 (tentative date) | | Virginia District Conventions |
| Saturday 10 May 2008 | Massachusetts State Committee and National Convention Delegate Meeting
Missouri State Convention
Ohio State Executive Committee | Arizona District Caucus and State Convention
Utah State Convention |
| Tuesday 13 May 2008 | Nebraska Advisory Primary
*West Virginia Primary1 | Nebraska Primary
*West Virginia Primary |
| Friday 16 May - Saturday 17 May 2008 | | Georgia State Convention |
| Friday 16 May - Sunday 18 May 2008 | | *Hawaii State Convention |
| Saturday 17 May 2008 | *Colorado State Convention
*Kansas State Convention
*Washington Congressional District Caucuses | |
| Saturday 17 May - Sunday 18 May 2008 | *Nevada State Convention | |
| Sunday 18 May 2008 | *California Delegation Meeting | |
| Tuesday 20 May 2008 | *Kentucky Primary1
*Oregon Primary1 | *Kentucky Primary
*Oregon Primary |
| Tuesday 20 May - Wednesday 21 May 2008 (tentative date) | | *New York State Committee |
| Thursday 22 May 2008 (tentative date) | | *Kansas State Party Committee Meeting |
| Friday 23 May - Sunday 25 May 2008 | Hawaii State Convention | |
| Saturday 24 May 2008 | *Alaska State Party Convention
Georgia State Committee Meeting
Vermont State Convention
*Wyoming State Convention | |
| Saturday 24 May - Saturday 7 June 2008 (tentative date) | | *Colorado District Conventions |
| Tuesday 27 May 2008 | Idaho Non-binding Primary | *Idaho Primary |
| Thursday 29 May - Saturday 31 May 2008 | | *Minnesota State Convention
*Washington State Convention |
| Friday 30 May - Saturday 31 May 2008 | | Virginia State Convention
*Wyoming Convention |
| Saturday 31 May 2008 | | *Colorado State Convention |
| Saturday 31 May - Sunday 1 June 2008 | *Maine State Convention. | |
| Sunday 1 June 2008 | *Puerto Rico Primary1 | |
| Sunday 1 June - Monday 2 June 2008 | | *Indiana State Convention |
| Sunday 1 June - Tuesday 10 June 2008 | Nebraska County Conventions | |
| Tuesday 3 June 2008 | *Montana Primary1
*South Dakota Primary1 | Montana Advisory Primary
New Jersey Election of Delegates
*New Mexico Primary
*South Dakota Primary |
| Tuesday 3 June 2008 (tentative date) | Florida Do-over Primary (cancelled) | |
| Friday 6 June 2008 | | *Pennsylvania Summer Meeting |
| Friday 6 June - Saturday 7 June 2008 | *Texas State Convention | |
| Friday 6 June - Sunday 8 June 2008 | Minnesota State Convention | North Carolina State Convention |
| Saturday 7 June 2008 | Kentucky State Convention
Mississippi State Convention
Pennsylvania State Committee
Vermont National Convention Delegate Meeting | *Illinois Convention |
| Sunday 8 June 2008 | Montana State Convention | |
| Thursday 12 June - Saturday 14 June 2008 | *Idaho State Convention | Idaho State Convention
Texas State Convention |
| Friday 13 June 2008 | Wisconsin State Convention | |
| Friday 13 June - Saturday 14 June 2008 | West Virginia State Convention & Executive Committee | |
| Friday 13 June - Sunday 15 June 2008 | *Washington State Convention | |
| Saturday 14 June 2008 | Iowa State Convention postponed
*Michigan State Central Committee
Virginia State Convention | Arkansas State Committee Meeting
Iowa State Convention postponed
*New Mexico State Republican Convention |
| Thursday 19 June 2008 | Rhode Island State Executive Committee | |
| Friday 20 June - Saturday 21 June 2008 | Indiana State Convention | |
| Friday 20 June - Sunday 22 June 2008 | *Nebraska State Convention | |
| Saturday 21 June 2008 | North Carolina State Convention
Oregon State Convention
Puerto Rico Democratic Assembly | |
| Saturday 28 June 2008 | *Iowa State Convention
South Dakota State Party Central Committee | Nevada Rump State Convention |
| Friday 11 July - Saturday 12 July 2008 | | *Iowa State Convention |
| Saturday 12 July 2008 | | *Nebraska State Convention
Oregon District Conventions |
| Saturday 26 July 2008 | | *Nevada State Convention |
| August 2008 | Unassigned To be determined | |
