If Susan Collins is your idea of an FF, you need to re-evaluate your standards.
If she had chucked the GOP, endorsed Hillary, and become a Democrat, I'd say she was an FF. Strom Thurmond chucked the Democratic Party (and his seniority) and became a Republican in 1964; in that sense (though not in his segregationist beliefs) he was an FF. Becoming a Southern Republican was a risk for Thurmond; he was consigning himself to the Senate minority where he could not hope to become a committee Chairman and where his influence in terms of bringing home the military bacon for SC was in question. Besides, there was no guarantee in 1964 that the Goldwater sweep was an aberration, and that the South would return to its Democratic voting habits within an election cycle or two. Collins could do the same, and with much less risk; that would be worthy of an FF. It's pretty bad when you can say of a sitting Senator, "We can't all be Strom Thurmond, now can we?". Like seriously, what bullshlt are you spouting now?? Susan Collins has been a Republican a lot longer than you or your pal Santender, and she has every right (and thankfully every intention) to remain one. She doesn't like the nominee, like A LOT of Republicans who see Trump's campaign as offensive and divisive and don't think that's the type of campaign the standard bearer for the Party of Lincoln should be running. Deal with it.
You know why Susan Collins doesn't become a Democrat? Because her economic views are HORRIBLY out of whack with the current Democratic Party. As are her views on guns. And her views on foreign policy. And a host of other issues. Just because she doesn't constantly talk about Jesus or hold
Bernie Sanders' views on trade or try conjure up a universe where Democrats are all rich, smart elites so it'd be easier to hate them doesn't mean she's some kind of fake Republican. And as long as she keeps that R next to her name, she has as much of a right to influence party discourse as anyone else in the party (which, yes, now unfortunately includes you and Santender).
And drop the act, you would have eaten Strom Thurmond's BS up and made some ridiculous post (in a world where Atlas existed in the '60s) about how Strom might have antiquated racial views, but at least he cares about good, hardworking
White, Christian Americans, making him better than those GOD DAMN elitist Northerners.