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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.

Biden will reverse Trump's attempt to lift COVID related travel restrictions

Photo: Tasos Katopodis via Getty

The incoming Biden administration will reverse President Trump's last-minute order to lift COVID-19 related travel restrictions, Jen Psaki, the incoming White House press secretary, tweeted.

Why it matters: President Trump ordered entry bans lifted for travelers from the U.K., Ireland, Brazil and much of Europe to go into effect Jan. 26, but the Biden administration will "strengthen public health measures around international travel in order to further mitigate the spread of COVID-19," Jen Psaki said. Biden will be inaugurated on Wednesday, Jan. 20 and Trump will no longer be president by the time the order is set to go into effect.

Dominion sends cease and desist letter to My Pillow CEO Mike Lindell

Photo: Stephen Maturen/Getty Images

Dominion Voting Systems on Monday sent a cease and desist letter to My Pillow CEO Mike Lindell over his spread of misinformation related to the 2020 election.

Why it matters: Trump and several of his allies have pushed false conspiracy theories about the company, leading Dominion to take legal action. It's suing pro-Trump lawyer Sidney Powell for defamation and $1.3 billion in damages, and a Dominion employee has sued Trump himself, OANN and Newsmax.