Montana Gov. Steve Bullock Steve BullockMcConnell locks down key GOP votes in Supreme Court fight Senate Democrats demand White House fire controversial head of public lands agency Pence seeks to boost Daines in critical Montana Senate race MORE, one of the two dozen Democrats running for the party's 2020 presidential nomination, said Sunday he is "disappointed" to miss the first debate, but added, "I don't think it's a blow to my campaign in the slightest."

Bullock is one of four Democrats who failed to meet criteria set out by the Democratic National Committee for the first debates, which will take place Wednesday and Thursday.

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Bullock missed the cut-off for the debates when he failed to either amass financial support from 65,000 unique donors or achieve 1 percent support in three qualifying polls. He was initially thought to have qualified until the DNC announced it would exclude one of the polls he was using.