The Green Papers
2018 Senatorial Primaries at a Glance


This "at a glance" look at the primary in each State simply lists the winner (and, in many cases, the candidate who came in second) in each Primary in chronological order.

boldface followed by (inc) indicates the incumbent

2018 Senatorial Primaries at a Glance
Date State Democrat
R Winner % Second % R Winner % Second %
Tuesday 6 March 2018 Texas   O'Rourke L Hernandez     Cruz (inc)      
Tuesday 8 May 2018 Indiana   Donnelly (inc) U       Braun 41 Rokita 30
Ohio   Brown (inc) U       Renacci 47 Gibbons 32
West Virginia   Manchin (inc) L Swearengin     Morrisey 35 Jenkins 29
Tuesday 15 May 2018 Nebraska   Raybould L Janicek     Fischer (inc)      
Pennsylvania   Casey (inc) U       Barletta L Christiana  
Tuesday 22 May 2018 Texas R         R        
Tuesday 5 June 2018 California   Feinstein 44 de León 11   No Republican will be on the General Election Ballot
Top Two Primary
Mississippi   Runoff Sherman (32) v Baria (31)   Wicker (inc)      
Montana   Tester (inc) U       Rosendale 34 Fagg 28
New Jersey   Menendez (inc) L McCormick     Hugin L Goldberg  
New Mexico   Heinrich (inc) U       Rich U    
Tuesday 12 June 2018 Maine   Ringelstein P       Brakey P    
Nevada   Rosen         Heller (inc) L Heck  
North Dakota   Heitkamp (inc) U       Cramer      
Virginia   Kaine (inc) P       Stewart 45 Freitas 43
Tuesday 26 June 2018 Maryland   Cardin (inc)         Campbell 29 Chaffee 24
Mississippi R Baria D Sherman   R        
New York   Gillibrand (inc) P       Farley P    
Utah   Wilson P       Romney L Kennedy  
Tuesday 17 July 2018 Alabama R         R        
Thursday 2 August 2018 Tennessee   Bredesen         Blackburn      
Tuesday 7 August 2018 Michigan   Stabenow (inc) U       James D Pensler  
Missouri   McCaskill         Hawley D Monetti  
Washington   Cantwell (inc) D       Hutchison 24    
Top Two Primary Top Two Primary
Saturday 11 August 2018 Hawaii   Hirono (inc) U       Curtis 24 Anderson 19
Tuesday 14 August 2018 Connecticut   Murphy (inc) P       Corey      
Minnesota Special   Smith (inc)         Housley L Anderson  
Minnesota   Klobuchar (inc)         Newberger L Anderson  
Vermont   Sanders (inc)         Paige 40 Zupan 38
Wisconsin   Baldwin (inc) U       Vukmir 49 Nicholson 43
Tuesday 21 August 2018 Wyoming   Trauner P       Barrasso (inc) L Dodson  
Tuesday 28 August 2018 Arizona   Sinema         McSally N Ward  
Florida   Nelson (inc) P       Scott      
Tuesday 4 September 2018 Massachusetts   Warren (inc) U       Diehl D Kingston  
Thursday 6 September 2018 Delaware   Carper L Harris     Arlett L Truono  
Wednesday 12 September 2018 Rhode Island   Whitehouse (inc)         Flanders      


  • If a candidate wins 75.5% or more of the primary vote, the second place finisher is not listed.
  • U means that this candidate ran in the primary unopposed (that is, with no other candidates appearing on the ballot but him/her). Please note that write-ins do NOT count as such "other candidates on the ballot" but the appearance of "Uncommitted" (or equivalent, such as "None of the Above") on a ballot DOES.
  • L indicates a landslide majority [60.5 to 75.4% of the primary vote] for the winner.
  • D indicates a decisive majority [52.5 to 60.4% of the primary vote] for the winner.
  • N indicates a narrow majority [50.0(+1 vote) to 52.4% of the primary vote] for the winner.
  • Where a winning (or, in a runoff State, leading) candidate has failed to gain at least a majority of the primary vote, the winner(leader) of the primary and the candidate who came in second are both listed with their respective percentages of the primary vote rounded up or down to the nearest whole integer.
  • C indicates the Party's nominee was chosen by a Party-run process other than the Primary (State Convention, Party Central Committee or equivalent).
  • P indicates Primary cancelled / nomination by default because nominee was the only candidate to have filed for this Party's Primary for this office. P also applies to nominees-to-be by apparent Party consensus (i.e. no opposition at an ensuing Convention).
  • R indicates any Runoff which has been scheduled for this date.

  2018 General Election Home  
  116th U.S. Senate Popular Vote and FEC Total Receipts by Party  
  Gubernatorial Popular Vote by Party  
  116th U.S. House Popular Vote and FEC Total Receipts by Party  
  Close Contests Summary - Decision by 2% or less  
  Contests Where No Candidate Received a Majority  
2018 Primaries and Runoffs for Statewide offices/Congress
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  Chronologically   --   Chronologically with Filing Deadlines  
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Poll Closing Times (list)
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  Gubernatorial Primaries at a Glance   --   Senatorial Primaries at a Glance  
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  2018 Partisan Composition by State  
  Political Parties  
  Senate Electoral Classes  
  Statewide Political Party Strength going into the 2018 Midterm Elections  
  Relative Political Party Strength by SECTION and Region going into the 2018 Midterm Election  
  Weighted Relative Political Party Strength by SECTION and Region  
  2018 Congressional Party Breakdown by Region  
  2018 STATE EXECUTIVE/LEGISLATIVE Political Party Breakdown by SECTION and Region  

  Comparative Political Party Predominance in each State, 2000 thru 2016  
  Political Party Floor Leaders in the Congress of the United States  
  Dates of DIRECT PRIMARY Elections re: Major Party Nominations for Statewide and/or Federal Office  
  Length of Terms of Office of STATE Governors throughout American History