Just one Democrat has represented Colorado’s ultra-Republican 4th Congressional District in the last half-century, but that Democrat — former U.S. Rep. Betsy Markey — thinks lightning could strike again in the district that sprawls across the Eastern Plains. “This is a tough hill to climb, but if Trisha has a solid get-out-the-vote campaign, and the top of the ticket performs well, she has a good shot at this,” said Markey, who represented the 4th District from for a single term, from 2009 to 2011. Trisha is Trisha Calvarese, a 37-year-old labor activist and speechwriter from Highlands Ranch who has helped run political campaigns in Pennsylvania and Massachusetts.