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Bullock, who is facing a crowded field of nearly two dozen candidates vying for the Democratic presidential nomination, will kick off his campaign with a Tuesday appearance at Helena High School before visiting Iowa, CBS reported.
The former Montana attorney general was elected governor in 2012 and is currently in his second term.
His campaign website describes the father of three as "a progressive who gets stuff done."
"Governor Bullock has been able to bridge partisan divides his entire career," the website says. "In the same year that Trump won the state by 20 points, Bullock won by 4."
According to CBS News, Bullock "has supported same-sex marriage, net neutrality and held pro-choice views on abortion."