Sen. Susan Collins, R-Maine, is the only Republican up for reelection this year – and one of two in the Senate, with Sen. Lisa Murkowski, R-Alaska – who has challenged McConnell's plans to bring a Supreme Court nominee through the chamber, weeks before the election. "People will be reminded in Maine of how important that vote was and they are going to hold it against Collins in all likelihood," Larry Sabato, director of UVA’s Center for Politics, said. Sabato’s Crystal Ball shifted Maine's Senate race in Democrats' favor on Monday morning, moving it from a toss-up to a lean toward the party.