Retiring Sen. Pete Domenici (R-N.M.) is stumping for his potential GOP successor in a new TV ad, despite having endorsed another Republican in the primary race for his seat.

Rep. Steve PearceStevan (Steve) Edward PearceNew Mexico Dems brace for crowded race to succeed Udall The 31 Trump districts that will determine the next House majority The legal scandal that no one is talking about MORE (R-N.M.) trails Democratic Rep. Tom Udall (N.M.) by an average of 17.7 percentage points in the race for Domenici's seat, according to major polls. Domenici initially endorsed Rep. Heather Wilson (R-N.M.) as his successor; Pearce defeated Wilson in the GOP primary.

In the ad, Domenici urges New Mexico voters to join him in passing the torch to Pearce.

"Together we've accomplished a lot for New Mexico. Now I must pass this work to someone who can continue our progress," Domenici says in the ad. "Steve Pearce is that someone."