Colorado's Democratic primaries are taking place today, serving as a critical test for the party's establishment. The focus has moved to the state following Democratic insurgent victories in New York one week ago.
Veteran Democrats running for the Senate, governor, and House are facing a round of insurgent challengers. These contests in a trio of races are threatening candidates backed by the party establishment.
The results will help answer whether voters are gravitating toward a younger, more progressive generation of leaders or sticking with established veterans. Today's primaries are poised to demonstrate both the strengths and limits of the leftist insurgency convulsing the party.