Citation on the 38%, or was that something Levin yelled about?
My guess is that if Cruz gets 38% of the remaining delegates, it precludes Trump from getting 1237 bound delegates before the convention. That sounds about right, it would be the difference between how many Trump has to tget, to get 1237 (62% sounds about right) and 100% or all of the remaining delegates.
looking for it. I think I saw it on 538 or national review.
It has to do with what Trump will be deprived of in WV, PA and upstate NY.