McBath, a Marietta Democrat in her first term, had initially backed former New York City mayor and her old boss Michael Bloomberg. Bloomberg's gun rights organization, Everytown for Gun Safety, had once employed her and spent over $4 million to help her get elected.

But Bloomberg's campaign ended a week ago after he fell far short of expectations on Super Tuesday. And race for the Democratic presidential nomination is now down to two candidates: Biden and U.S. Sen. Bernie Sanders of Vermont.