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Photo: Getty Images

There are 35 Senate seats up for election in 2020 — including a special election in Arizona — many of which are expected to be brutally competitive as Democrats vie for control of the Senate.

Quick take: The Senate is currently made up of 53 Republicans, 45 Democrats and 2 independents who caucus with the Democrats. Dems must win 3 or 4 GOP-held seats to take control of the Senate — 3 if the new vice president is a Democrat and 4 if not.

  • Republican senators representing left-leaning states or states that are shifting demographically — Susan Collins (Maine), Cory Gardner (Colo.) and Martha McSally (Ariz.) — are considered among the Democrats’ clearest 2020 targets.
  • As Democrats from Trump-won states, Sen. Gary Peters (D-Mich.) and Sen. Doug Jones (D-Ala.) are also vulnerable.

Republicans - Cook Political Report race classification:

  • Sen. Martha McSally (Ariz.) - Lean Democratic
  • Sen. Thom Tillis (N.C.) - Toss up
  • Sen. Susan Collins (Maine) - Toss up
  • Sen. Steve Daines (Mt.) - Toss up
  • Sen. Joni Ernst (Iowa) - Toss up
  • Sen. Cory Gardner (Colo.) - Toss up
  • Sen. David Perdue (Ga.) - Toss up
  • Sen. Lindsey Graham (S.C.) - Lean Republican
  • Sen. Kelly Loeffler (Ga.) — Lean R
  • Sen. James Risch (Idaho) - Lean R
  • Open Kansas seat held by retiring Pat Roberts - Lean R
  • Sen. Dan Sullivan (Alaska) - Likely R
  • Sen. John Cornyn (Texas) - Likely R
  • Sen. Mitch McConnell (Ky.) - Solid R
  • Sen. Mike Rounds (S. D.) - Solid R
  • Sen. Ben Sasse (Neb.) - Solid R
  • Sen. Bill Cassidy (La.) - Solid R
  • Sen. Cindy Hyde-Smith (Miss.) - Solid R
  • Sen. James Inhofe (Okla.) - Solid R
  • Sen. Tom Cotton (Ark.) - Solid R
  • Sen. Shelley Moore Capito (W.V.) - Solid R
  • Open Tennessee seat held by retiring Lamar Alexander - Solid R
  • Open Wyoming seat held by retiring Mike Enzi - Solid R

Democrats - Cook Political Report race classification:

  • Sen. Doug Jones (Ala.) - Lean Republican
  • Sen. Gary Peters (Mich.) - Lean Democrat
  • Sen. Cory Booker (N.J.) - Solid D
  • Sen. Chris Coons (Del.) - Solid D
  • Sen. Dick Durbin (Ill.) - Solid D
  • Sen. Ed Markey (Mass.) - Solid D
  • Sen. Jeff Merkley (Ore.) - Solid D
  • Sen. Jack Reed (R.I.) - Solid D
  • Sen. Jeanne Shaheen (N.H.) - Solid D
  • Sen. Tina Smith (Minn.) - Solid D
  • Sen. Mark Warner (Va.) - Solid D
  • Open New Mexico seat held by retiring Tom Udall - Solid D

Editor's note: This story has been corrected to show 35 Senate seats up for election in 2020, not 36.

Go deeper

Updated Dec 7, 2020 - Politics & Policy

The top Republicans who have acknowledged Biden as president-elect

Photo: Tasos Katopodis/Getty Images

Some elected Republicans are breaking ranks with President Trump to acknowledge that President-elect Biden won the 2020 presidential election.

Why it matters: The relative sparsity of acknowledgements highlights Trump's lasting power in the GOP, as his campaign moves to file multiple lawsuits alleging voter fraud in key swing states — despite the fact that there have been no credible allegations of any widespread fraud anywhere in the U.S.

Updated 2 hours ago - Politics & Policy

Omicron dashboard

Illustration: Brendan Lynch/Axios

  1. Health: Pfizer and Moderna boosters overwhelmingly prevent Omicron hospitalizations, CDC finds — Omicron pushes COVID deaths toward 2,000 per day — The pandemic-proof health care giant.
  2. Vaccines: The case for Operation Warp Speed 2.0 — Starbucks drops worker vaccine or test requirement after SCOTUS ruling — Kids' COVID vaccination rates are particularly low in rural America.
  3. Politics: Biden concedes U.S. should have done more testing — Arizona says it "will not be intimidated" by Biden on anti-mask school policies — Federal judge blocks Biden's vaccine mandate for federal workers.
  4. World: American Airlines flight to London forced to turn around over mask dispute — WHO: COVID health emergency could end this year — Greece imposes vaccine mandate for people 60 and older — Austria approves COVID vaccine mandate for adults.
  5. Variant tracker

Arizona governor sues Biden administration over COVID funds tied to mandates

A teacher prepares a hallway barrier to help students maintain social distancing at John B. Wright Elementary School in Tucson, Arizona, on Aug. 14, 2020. Photo: Cheney Orr/Bloomberg via Getty Images

Arizona Gov. Doug Ducey (R) filed a lawsuit Friday against the Biden administration for ordering the state to stop allocating federal COVID relief funds to schools that don't comply with public health recommendations such as masking, the Arizona Republic reports.

Why it matters: The Treasury Department said last week that the state would have to pay back the money if Ducey does not redesignate the $173 million programs to ensure they don't "undermine efforts to stop the spread of COVID-19."