I’d guess they have help from Graham, Mitt, Rubio and republican donors. Probably in secret backroom conversations and undeclared donations.
The longer that kind of coordination is even realistic possibility in peoples’ minds, the worse the party chances are no matter who wins the nomination or how.
http://www.sho.com/sho/video/titles/47809/untitled
Watch this. 3 minutes. There is a ton going on behind the scenes to stop Trump.