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Arkansas Senate|By Jennifer Duffy, September 25, 2015

Republican U.S. Sen. John Boozman won this seat in 2010 by defeating then-Democratic Sen. Blanche Lincoln by a whopping 21 points. Not coincidently, the race was never really about him. It was all about Lincoln, and whether her infrequent trips back to the state were a sign that she had lost touch, and whether her votes in favor of the economic stimulus legislation and healthcare reform meant...

Arizona Senate|By Jennifer Duffy, September 18, 2015

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, September 11, 2015

Arizona: As he gears up to seek a sixth term, Republican Sen. John McCain may have fights on his hands in both the primary and the general election. In 2010, former U.S. Rep. J.D. Hayworth challenged McCain in the GOP primary, arguing that the incumbent is too moderate. McCain prevailed though with 56 percent to 32 percent for Hayworth, and went on to win the general election with 59 percent....

Alabama Senate|By Jennifer Duffy, August 7, 2015

A huge campaign war chest, a very red state and seniority in the Senate combine to ensure that Republican Sen. Richard Shelby gets re-elected with ease. In fact, no credible Democrat gives the idea of challenging either of the state’s two U.S. Senators even a passing glance.

Alaska Senate|By Jennifer Duffy, August 7, 2015

As Republican Sen. Lisa Murkowski approaches a campaign for a second full term, the question waiting to be answered is what kind of race will she get? At this point in 2009, it looked as if Murkowski was on a glide path to re-election, but ended up losing the primary to Tea Party candidate Joe Miller and winning re-election as a write-in candidate. It’s hard to fathom that scenario repeating...

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 1 1 7 24 11
Republicans (54) 24 4 3 5 12 8 22
Toss Up Lean R Likely R Solid R

Senate Race Ratings Map

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  • 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 05:23 PM, Oct 1
  • Race Ratings
    The Cook Political Report's latest ratings for all competitive and potentially competitive Senate seats.
    Updated 10:17 AM, Oct 5
  • 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 06:07 PM, Aug 6
  • 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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