I think that tactic is known as Bait and Switch. Let him dare to switch parties and join all his new friends having such a ball. The moment they have his vote on something like Amnesty or a Value Added Tax (VAT( to be put on everything) they will drop him like a hot, stinky potato, thrown far out to the back pasture. Sort of like a grenade.
“...Let him dare to switch parties and join all his new friends...”
Worked well for the late Senator from PA - Arlin Spect(at)or. McConnell is a political doofus.