Liberal Sen. Elizabeth Warren (D), a former law professor, appears to be a lock for reelection and could be looking at a 2020 presidential bid. Her Republican challenger will be either Geoff Diehl, a Trump-aligned state lawmaker who earned the Republican convention endorsement, businessman John Kingston or Beth Joyce Lindstrom, who served in Mitt Romney's administration.
Though the state backed Hillary Clinton by nearly 30 points, popular Republican Gov. Charlie Baker is expected to coast to re-election. Conservative pastor Scott Lively is challenging Baker in the primary. Two Democrats are vying for the nomination: former state finance director Jay Gonzalez and Bob Massie, who ran unsuccessfully for lieutenant governor in 1994.