Here is an extensive list I compiled of candidates running to unseat Republican senators in 2020

https://abs.twimg.com/emoji/v2/... draggable="false" alt="🔴" title="Red circle" aria-label="Emoji: Red circle"> Mitch McConnell (R)—KY

Amy McGrath @AmyMcGrathKY

https://abs.twimg.com/emoji/v2/... draggable="false" alt="🔴" title="Red circle" aria-label="Emoji: Red circle"> Lindsey Graham (R)—SC

Jaime Harrison @harrisonjaime
Justin @JustinWootonSC

THREAD

1/9

https://abs.twimg.com/emoji/v2/... draggable="false" alt="🔴" title="Red circle" aria-label="Emoji: Red circle"> Susan Collins (R)—ME

Tiffany Bond @TiffanyBond
Betsy Sweet @BetsySweetME
Danielle VanHelsing
Sara Gideon @SaraGideon
Bre Kidman @BeeKay4ME
Ross LaJeunesse @RossforMaine

https://abs.twimg.com/emoji/v2/... draggable="false" alt="🔴" title="Red circle" aria-label="Emoji: Red circle"> David Perdue (R)—GA

Marckeith DeJesus @MarckeithD
Teresa Tomlinson @teresatomlinson

2/9

https://abs.twimg.com/emoji/v2/... draggable="false" alt="🔴" title="Red circle" aria-label="Emoji: Red circle"> John Cornyn (R)—TX

Chris Bell @BellForSenate
Michael Cooper @Cooper4Texas
Amanda Edwards @AmandaForTexas
Jack D Foster Jr @JackDanielFost1
Annie Garcia @RunAnnieRun2
Mary Hegar @mjhegar
Adrian Ocegueda @TxReason
Cristina T Ramirez @cristinafortx
Royce West @SenRoyceWest

3/9

https://abs.twimg.com/emoji/v2/... draggable="false" alt="🔴" title="Red circle" aria-label="Emoji: Red circle"> Tom Cotton (R)—AR

No Dem challenger

https://abs.twimg.com/emoji/v2/... draggable="false" alt="🔴" title="Red circle" aria-label="Emoji: Red circle"> Ben Sasse (R)—NE

Chris Janicek @CJSenate2020
Angie Philips @AngieForNe
Alisha Shelton @Shelton4Senate

https://abs.twimg.com/emoji/v2/... draggable="false" alt="🔴" title="Red circle" aria-label="Emoji: Red circle"> Joni Ernst (R)—IA

Theresa Greenfield @GreenfieldIowa
Eddie J Mauro @eddiejmauro
Michael Franken @FrankenforIowa

4/9

https://abs.twimg.com/emoji/v2/... draggable="false" alt="🔴" title="Red circle" aria-label="Emoji: Red circle"> Mike Enzi (R)—WY

Yana Ludwig @ForWyo

https://abs.twimg.com/emoji/v2/... draggable="false" alt="🔴" title="Red circle" aria-label="Emoji: Red circle"> Bill Cassidy (R)—LA

Antoine Pierce @AntoinePierce

https://abs.twimg.com/emoji/v2/... draggable="false" alt="🔴" title="Red circle" aria-label="Emoji: Red circle"> Steve Daines (R)—MT

Wilmot Collins @CollinsWilmot
Mike Knoles @KnolesMichael
John Mues @MuesforMontana
Cora Neumann @CoraforMT

5/9

https://abs.twimg.com/emoji/v2/... draggable="false" alt="🔴" title="Red circle" aria-label="Emoji: Red circle"> Lamar Alexander (R)—TN

@James_Mackler

https://abs.twimg.com/emoji/v2/... draggable="false" alt="🔴" title="Red circle" aria-label="Emoji: Red circle"> Cindy Hyde-Smith (R)—MS

Jensen Bohren @BohrenJensen
Mike Espy @MikeEspyMS

https://abs.twimg.com/emoji/v2/... draggable="false" alt="🔴" title="Red circle" aria-label="Emoji: Red circle"> Shelley Moore Capito (R)—WV

Paula J Swearengin @paulajean2020

https://abs.twimg.com/emoji/v2/... draggable="false" alt="🔴" title="Red circle" aria-label="Emoji: Red circle"> James Inhofe (R)—OK

Abby Broyles @abbybroyles

6/9

https://abs.twimg.com/emoji/v2/... draggable="false" alt="🔴" title="Red circle" aria-label="Emoji: Red circle"> Cory Gardner (R)—CO

Stephany Spaulding @StephanyForCO
Lorena Garcia @lorenaforsenate

https://abs.twimg.com/emoji/v2/... draggable="false" alt="🔴" title="Red circle" aria-label="Emoji: Red circle"> Mike Rounds (R)—SD

Dan Ahlers @ahlers_dan
Clara Hart

https://abs.twimg.com/emoji/v2/... draggable="false" alt="🔴" title="Red circle" aria-label="Emoji: Red circle"> Dan Sullivan (R)—AK

No Dem Challenger

https://abs.twimg.com/emoji/v2/... draggable="false" alt="🔴" title="Red circle" aria-label="Emoji: Red circle"> Pat Roberts (R)—KS

Barbara Bollier @BarbaraBollier

7/9

https://abs.twimg.com/emoji/v2/... draggable="false" alt="🔴" title="Red circle" aria-label="Emoji: Red circle"> Thom Tillis (R)—NC

Cal Cunningham @CalforNC
Trevor Fuller @fullerfornc
Atul Goel @AtulGoel4Senate
Erica Smith @EricaforUSSen20
Steve Swenson

8/9

https://abs.twimg.com/emoji/v2/... draggable="false" alt="🔴" title="Red circle" aria-label="Emoji: Red circle"> Jim Risch (R)—ID

Nancy Harris @NancyH4Senate
Travis Oler @realTravisOler
Jim Vandermaas @votevandermaas

Special election:

https://abs.twimg.com/emoji/v2/... draggable="false" alt="🔴" title="Red circle" aria-label="Emoji: Red circle"> Martha McSally (R)—AZ

Mark Kelly @ShuttleCDRKelly

https://abs.twimg.com/emoji/v2/... draggable="false" alt="🔴" title="Red circle" aria-label="Emoji: Red circle"> Kelly Loeffler (R)—GA

Matt Lieberman @LiebermanForGa

9/9