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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.

Teachers across the U.S. protest laws restricting racism lessons

Thousands of teachers and other educators held protests across the U.S. Saturday against the actions of "at least 15 Republican-led states" that aim to restrict teaching about racism in class, the Washington Post reports.

Driving the news: There were demonstrations in at least 22 cities for the "Day of Action" to raise awareness about moves to limit students' exposure to critical race theory, which links racial discrimination to the nation's foundations and legal system, per Axios' Russell Contreras.

Updated 2 hours ago - Health

Lawsuit challenging Houston Methodist's COVID vaccine mandate dismissed

Houston Methodist Hospital in Houston, Texas. Photo: Brandon Bell/Getty Images

A federal judge on Saturday dismissed a lawsuit brought by 117 Houston Methodist staff over the hospital's policy requiring all employees to be vaccinated against COVID-19.

Why it matters: This is the first federal court ruling on a coronavirus vaccine mandate. Attorney Jared Woodfill, representing the plaintiffs, told KHOU 11 it's "the first battle in a long fight," as he vowed to file another lawsuit soon.