These tea partiers reflect more of WF Buckley's roots (i.e. Goldwater)than his subsequent Trotskyesq/Neocon conversion. Thus if he is turning in his grave it is more likely because of ideological differences and his true disgust would be on the issue of how low his neocon schism has gone the way of Bush Jr/Rush Limbaugh etc.
Although some may attempt to court the Tea Parties like Palin (although her credentials raises disparities with their ideology), in general the current leadership of the GOP are more warry of them than than the liberals.
I don't know what to make of them long term as they are more of a backlash of various groups some against both Obama and the others against the Neocon leadership within the GOP and some against both. Who they become depend on their leadership. Right now as a constitutional and antiNeocon I currently see them amicably as enemy of my (i.e. our constitutions) enemy.