washington susan collins one remain moderate republicans u.s. senate expect announce friday whether run governor maine next year would bid replace conservative governor paul lepage collins spokeswoman confirm plan declare intentions gubernatorial race follow months speculation whether four-term senator would will leave senate play pivotal role last month collins one three republican senators publicly announce opposition bill repeal obamacare healthcare law replace limit plan lepage also republican bar state law seek another term collins decide run could keep senate seat campaign term senator expire end 2020 64-year-old collins easily re-election senate seat 2014 nearly 70 percent vote one centrists bitterly divide senate collins often cast bridge republicans democrats seek bipartisan compromise maine attorney general janet mill say seek democratic nomination governor senator collins say friday run maine governor