GOP insiders say they see 3rd party challenge if Trump is nominated

[Attorney General & PPT Dwarven Dragon]

The logistical questions would be huge. Let's say they start right after a big Trump win on Super Tuesday. They'd need to get some guy on the ballot in all 50 states in very, very short order, and it'd have to probably be someone not currently running to not get in the way of sore loser laws, and it'd have to be someone who has no future in elected office that they'd be throwing away by ruining their reputation this way.

Basically it'd have to be Mitt Romney.

What about Huntsman?

[Attorney General & PPT Dwarven Dragon]

Disaffected Republicans? Democrats welcome you.

Uh, no you don't.  It's more en vogue to make fun of Republicans for killing off their moderates, but have you watched your own debates?  Hillary Clinton is about the most standard liberal Democrat on the planet, and she's being painted as a corporatist by her competition.  How would a candidate standing up there talking about out of control debt, too much regulation on business and cutting taxes for everyone be received??  The GOP being a bit crazier doesn't excuse the Democrats' purity tests.  Face it, to be a Democratic nominee, at the end of the day, you HAVE to play the game of getting the "middle class" to the polls.

Meh. The whole "corporatist" thing is only really a litmus test for the Bernie/Occupy wing of the party. Jim Webb was probably too far to the right for the Democratic Primary electorate, but was still more at home as a member of the party than most RINOs. The only real litmus test for Democrats by now is gay marriage, and there are exceptions to that rule as well.

Plus being (generally) pro-choice, at least outside of the south.