Restless Democratic voters are rejecting their party's establishment. Six months before Election Day, Democratic voters are embracing change, taking a clear risk by picking less established and more polarizing candidates to represent them on the ballot this fall. In Maine, Gov. Janet Mills has been forced to formally abandon her U.S. Senate campaign, unable to generate sufficient fundraising or enthusiasm to compete in a primary against Graham Platner, an oyster farmer with no political experience. Mills' announcement Thursday marked a stinging defeat for Senate Democratic leader Chuck Schumer, who recruited her to lead the party's decades-long quest to defeat Republican Sen. Susan Collins.