Best possible current challenger candidates in Senate races

[President Punxsutawney Phil]

For the GOP
-AZ: Would've been Ducey a year ago, now probably Kimberly Yee.
-CA: Perhaps David Valadao or Mike Garcia? Of course nobody's winning this state.
-CO: Mike Coffman?
-CT: Erin Stewart, perhaps?
-GA: Vernon Jones?
-HI: Their best shot is probably convincing Tulsi Gabbard to join the party.
-IL: Adam Kinzinger
-MD: Larry Hogan
-NH: Chris Sununu
-NV: Brian Sandoval, but I doubt he'd run.
-NY: From the house bench, probably John Katko.
-OR: Knute?
-VT: Phil Scott
-WA: Kim Wyman, or maybe Jaime Herrera Beutler

For the Democrats
-AK: Getting Murkowski to switch parties.
-AL: Doug Jones
-AR: Mike Beebe?
-FL: Debbie Mucarsel-Powell?
-ID: Paulette Jordan?
-IN: Pete Buttigieg
-IA: Rob Sand? This seat is probably unwinnable without Steve King as the GOP nominee.
-KS: Laura Kelly
-KY: Andy Beshear
-LA: John Bel Edwards, but he won't let Nungesser become Governor a year early.
-MO: Jason Kander
-NC: Roy Cooper isn't happening because of Mark Robinson. Jeff Jackson sounds decent enough.
-ND: Heidi Heitkamp
-OH: Tim Ryan
-OK: Kendra Horn?
-PA: Tom Wolf
-SC: Joe Cunningham
-SD: Billie Sutton
-UT: Ben McAdams
-WI: Ron Kind

Agreed overall. For OK Dems, maybe Brad Henry? Yeah, ik, running former Governors didn't seem to work out well in general, but I guess he'd still be a more formidable challenger than a Congresswoman who was defeated after one term in office.

Worked well for Bredesen.

Bredesen was probably the best candidate Dems could have came up with. All things being considered, he outperformed the state's partisanship to a remarkable degree.