Colorado U.S. Sen. Cory Gardner's seat has been ranked the second most likely to flip in 2020 by the National Journal.
His seat is topped on the publication's list only by that of Democratic Sen. Doug Jones of Alabama.
The other eight seats rated as likely to flip between blue and red by the Journal are, in order, Arizona, North Carolina, Maine, Iowa, Mississippi, Georgia, Texas and the other Georgia seat.
Gardner currently has nine Democrats running against him for senate, after John Walsh dropped out of the race Wednesday and Dan Baer dropped out Thursday, each endorsing former Gov. John Hickenlooper.
Hickenlooper has been viewed as the frontrunner due to endorsements from national Democratic organizations as well as initial polling indicating he would be the most successful challenger for Gardner.
Polling in July demonstrated a 40% approval rating for Gardner, released by Keating Research, OnSight Public Affairs and Martin Campaigns.
“People are calling us the underdogs," Chris Hansen, Gardner’s 2014 campaign manager and consultant for his re-election bid, told Colorado Politics in August. "Well, the underdogs always have to fight to win and Cory likes fighting."