Rep. Betsy Markey (CO-4) was one of nearly 40 Democrats who voted against adjournment citing resolution of the tax cut extension issue, joining her Republican colleagues:

House Democrats on Wednesday barely won a 210-209 vote to adjourn the House without extending the Bush tax cuts.
Thirty-nine House Democrats voted against adjournment after Minority Leader John Boehner (R-Ohio) urged opposition to the motion in a floor speech that said it would be irresponsible for Congress to leave without providing certainty on the tax issue. Dozens of Democrats in tough races voted against adjourning.
“Vote no on this adjournment resolution. Give Congress a chance to vote on extending tax rates,” Boehner said. […]
Wednesday’s vote, however, made it clear that dozens of Democrats were uncomfortable with leaving Washington without a vote on extending the tax cuts. [emphasis added]

Only Markey voted against adjournment. The other four members of Colorado’s Democratic Congressional delegation voted to adjourn–DeGette (CO-1), Perlmutter (CO-7), Polis (CO-2), and Salazar (CO-3).