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Arizona Senate|By Jennifer Duffy, July 22, 2016

Republican Sen. John McCain has been at the top of the Tea Party’s target list since before there was a Tea Party movement. GOP conservatives have always found the five-term incumbent too moderate for their liking and have worked to unseat him with little to show for their efforts. This cycle will be no different, and the idea that a competitive GOP primary might either unseat McCain or...

Senate Overview|By Jennifer Duffy, July 22, 2016

Democrats want to put as many Republican-held seats in play as possible. In a best case scenario it puts them in a strong position if a wave develops in the fall. At the very least, they hope it forces Republicans to devote resources to more races, spreading them thin.

Florida Senate|By Jennifer Duffy, July 15, 2016

For much of this cycle, this was an open-seat race as incumbent U.S. Sen. Marco Rubio had announced that he would not seek re-election so that he could devote his time to seeking the Republican presidential nomination. And, it was increasingly looking like a contest that was slipping away from Republicans.

Indiana Senate|By Charlie Cook, July 15, 2016

Democrats are feeling bullish these days, and former Sen. Evan Bayh’s decision to jump into Indiana’s Senate race adds to their upbeat mood. With a $9.3 million war chest left over from his last Senate campaign, Bayh gives his party a far better chance of picking up a seat than it would have had otherwise.

Senate Overview|By Charlie Cook, July 5, 2016

The word “volatile” doesn’t begin to describe the fight for a Senate majority this year. With the current split of 54 Republicans and 46 Democrats, the Democrats need a net gain of four seats if they retain the White House (the incoming vice president would break the tie in that event) and five seats if Republicans win the presidential race. The questions that political analysts are asking...

Senate Dashboard

Seats Up in 2016 Toss Up Lean D Likely D Solid D Seats Up in 2018 Seats Up in 2020
Democrats (45) 10 1 0 1 8 24 11
Republicans (54) 24 7 3 3 11 8 22
Toss Up Lean R Likely R Solid R

Senate Race Ratings Map

Interactive Map


  • At-A-Glance
    A listing of candidates and race ratings in all current Senate races. Updated weekly and printable for on-the-run reference.
    Updated 06:12 AM, Jul 29
  • Race Ratings
    The Cook Political Report's latest ratings for all competitive and potentially competitive Senate seats.
    Updated 06:43 AM, Jul 22
  • General Election Polls
    A selection of public opinion polling in Senate general election contests across the nation.
  • Primary Trial Heats
    A selection of public opinion polling in Senate primary election contests across the nation.
    Updated 08:00 AM, Sep 12
  • FEC Report
    A summary of key financial information filed by Senate candidates with the Federal Election Commission.
    Updated 05:52 AM, May 13
  • 2014 Battleground Chart
    2014 Senate Races: Romney Performance vs. Obama Performance
    November 12, 2012
  • 2012 Senate General Election Polls with Final Results
    A collection of polling data from the 2012 cycle, with final general election results included.
  • Two-Term Presidents: Post-WWII Partisan Trends
    Opposing party gains under and following second term presidents.
  • Senate Scatterplot
    The Cook Political Report Senate Scatterplot for Republican and Democratic held states by win percentage and PVI.
  • Senate: 2014 55% and Under Charts
    The chart below displays Senators up for reelection in 2014 who won with less than 55% of the vote in 2008.

Jennifer Duffy, Senior Editor

Jennifer Duffy is Senior Editor for The Cook Political Report, where she is responsible for U.S. Senate and Governors races.
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