"I am finally done with the republican party - come hell or high water I will vote for the Constitution party from now on."
One reason to stay would be to vote in the GOP primaries. If a reasonably conservative candidate doesn't make it through, then it would be appropriate to put votes elsewhere during the election. Isn't that the only way for the base to shape the Party?
"I am finally done with the republican party - come hell or high water I will vote for the Constitution party from now on."
I wouldn't do that yet.
Wait to see what the Senate does on the nuclear option.
They may understand that the Republican majority is going to fall apart at the grass roots if they don't pass it, and that may motivate the waverers to vote for it. Then there will be an increasingly conservative judiciary, and things can perhaps start to move in the direction you desire.
If they fail on the nuclear option, that will mean there is actually no HOPE of change, and at that point it is reasonable to go vote for a third party which also has no hope of changing anything, because if the Republicans have the power and won't do it, you are still at zero and no worse off being at zero among different folks who didn't betray you.
But the Republicans haven't betrayed you yet.
The Bush brothers look to be playing Pontius Pilate with the life of Terri, but that is them, not the Republican Party. What the Republicans do in the Senate IS the Party.
Hold your fire, and don't leave the tent just yet. Not even though lots of your fellow Republicans here and elsewhere are so eager to show you the door. The fear of loss may bring the Senate to reason, in which case you will still want to be inside the tent.