Schwarzenegger only became the populist he is now after the GOP bungled his reform campaigns, and he threw his lot in with Democrats because he couldn't beat them. Greenies and Demos that support Paul wouldn't let him get away with anything truly conservative; they would do what the MoveOnCodePinkoANSWER crowd is doing with the Democrats, which is to say "You owe us. Dance, monkey."
And that's just what happens when you elect an unprincipled flip-flopping RINO to a position of power.