Remember the Club For Growth (iirc the name) which for years tried to get weak congressional Republicans replaced with strong conservatives, usually ended up handing the seats to Democrats instead. Do not let the perfect become the enemy of the good.
After grabage like Arlen Spector, where he was behind in his last election and G.W. Bush went and pulled his sorry ass out of a loss the pos turned around and threw Bush and the pubbies under the bus.
Better to be a smaller party and at least have an idea where your people stand.
And Spector was but one of many pubbies that should be keel hauled. And of course I know he is now a rat.
BUT crap like my governor Crist, or Lindsey Graham etc.? Throw them away like old garbage.