Governor Deval Patrick, who had said he would not endorse in the Democratic Senate primary, on Wednesday threw his support behind Elizabeth Warren, seeking to boost her campaign as she faces continued questioning over her assertions of Native American heritage. Patrick’s endorsement comes just three days before the Democratic convention in Springfield, where some Democrats are hoping to elbow aside Marisa DeFranco, a potential challenger to Warren, by ensuring she does not receive the 15 percent support needed to earn a spot on the September primary ballot.
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