Rep. David Skaggs, saying he lacks "fire in the belly," has decided he won't run for the Senate and won't seek re-election to his House seat.
Skaggs, first elected to Congress in 1986, had been the only Democrat officially to announce plans to try to unseat Republican Sen. Ben Nighthorse Campbell.
But Dottie Lamm, wife of former Colorado Gov. Richard Lamm, is considering a bid for the Democratic nomination next year.
At a weekend news conference, Skaggs said that contributed to his decision to get out of the Senate race.
"You must, in fact, have that fire in the belly. In the last few weeks, I've realized it's not there for me," he said.
Skaggs, 53, said he also decided against running again for his 2nd Congressional District seat.