Colorado Politics — Colorado voters have never before faced as many congressional primaries as they do this year. There’s a primary in every congressional district but one — the 7th, where U.S. Rep. Ed Perlmutter will be facing Republican Mark Barrington in November in the Arvada Democrat’s bid for a seventh term.

Elsewhere, a combination of sky-high enthusiasm among Democrats angered by President Donald Trump and emboldened activist bases in both parties spells primary races, including some that could help determine which party holds the gavel in the U.S. House of Representatives next year.

The longest-serving Democrat and Republican in the state’s congressional delegation are each facing challengers from the left and right wings of their parties, respectively.

U.S. Rep. Diana DeGette is running for a 12th term in the the safely Democratic Denver-based 1st Congressional District against political newcomer Saira Rao, a former Wall Street attorney and founder of a company that packages children’s books that emphasize diverse points of view. It’s only DeGette’s third primary since she won the seat in 1996.

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