U.S. Rep. Yadira Caraveo has built a slight edge over Republican opponent Gabe Evans in Colorado’s tightest congressional contest less than a week before the Nov. 5 election, according to a poll released Wednesday. But her lead — less than 2 percentage points — remained well within the survey’s margin of error. The latest data from Emerson College Polling’s survey of 485 voters in the 8th Congressional District north of Denver shows 47.5% of voters backing the freshman Democrat and pediatrician, versus 45.8% favoring Evans, a state representative who’s an Army veteran and a former Arvada police officer.