he need to takes tea party support. since december cruz has slightly more tea party support than trump
And how exactly does he do that? so far the only relevant answers seem to be hope for a late Huck or Santorum surge to weaken Cruz, which as noted he has little control over.
I'll offer my own 2 cents: Hit the airways hard and now. Trump's perfect TV awareness talking in his ultra-classy office to an off-screen interviewer, interposed with shots of YUGE enthusiastic rally crowds (minus shots of supporters beating up minority hecklers of course). The goal being to simultaneously convey "presidential" and "outsider".
Otherwise, it sounds like his chance to effectively end the nomination race with a IA win is effectively doomed.