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, a 2020 Democratic presidential candidate, said on Sunday that he has secured the endorsement of Sen. Jon Tester Jonathan (Jon) TesterDemocrats shoot down talk of expanding Supreme Court Pence seeks to boost Daines in critical Montana Senate race This World Suicide Prevention Day, let's recommit to protecting the lives of our veterans MORE (D-Mont.) in his White House bid.

Bullock said on CBS's "Face the Nation" that he's "awfully excited" about the support from his fellow red state Democrat.

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"I've known and worked with him for a long time now," Bullock said.

"But he's also been such a voice in both rural areas, places that we need to win back, bridging some of the divides, he got over a dozen bills just dealing with the veterans' passed under even this president, and he's also — though D.C. hasn't done much — he's been a voice for making sure that we get the big money out of the system, which we have to do."

Bullock has struggled in the polls since announcing his candidacy and has sought to differentiate himself as a candidate that can win in a state President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE carried.

He is averaging less than one-half percent support in the RealClearPolitics average of recent presidential polls.