Tipton and Pace have a debate planned Wednesday evening in Pueblo. The candidates have debated before but have no additional debates set before next month's election.
Pace is trying to unseat Tipton after a single term. Pace says Tipton sides too closely with Republicans in the House who support big changes to Medicare and other budget cuts.
Tipton is trying to fend off the challenge with appeals on his service to the district, including support for a new Chimney Rock National Monument in Durango.
Tipton argues that Pace is too liberal for the district.
(Copyright 2012 by The Associated Press. All Rights Reserved.)