Gov. Gavin Newsom (D-CA) is facing a high-stakes decision that could shape not only the contest to succeed him, but his own political future. Former Rep. Eric Swalwell’s abrupt exit from California’s gubernatorial race following allegations of sexual assault has further splintered an already crowded and volatile Democratic field. Party insiders have been urging Newsom to step in to help consolidate support behind a credible candidate, or at leas…