[Vic S]

Bush won't quit. His campaign is running him as a stealth democrat and waiting for the first dozen or so open primaries where they can get out the democrat vote to push him over the top. They'll push Carson and Fiorina to take votes away from Trump and try to win it that way.

[tanknetter]

He doesn’t have to quit until he’s out of money. And he’s still got a decent fundraising Rolodex, enough to keep his campaign operational (treading water) assuming that as other candidates drop out their support will flow to him.