evidence: Murkowski is one of a handful of GOP senators who are not supporting the former president in November; others in that camp include Mitt Romney of Utah, Susan Collins of Maine and Todd Young of Indiana. None of those senators are backing Harris either, even as the Democratic nominee collects endorsements from former GOP officials whose Trump defections are delighting her party. [...] It’s one thing for former elected officials to endorse across the aisle. It’s a much bigger deal for sitting senators or congressmen to endorse the opposing party’s nominee. Prior GOP Trump critics, from Mitch McConnell on down, have largely fallen in line with the former president, reasoning that party unity is the best way to enact conservative policies. [...] Romney has the most political freedom of any Republican senator to cross Trump, since he’s retiring at the end of the year and will soon exit public service. He hasn’t gone there yet, however.