The GOP is backing Cruz now because they have no choice.
The choice is either back Cruz or Hillary wins. There is no other option.
Just like the OP of this thread. You answer a question with another question and when that gets returned with a question to you, you revert to the “universal axiom” that “Ted is the only one that can beat Hillary.” You can’t set up your fantasy football league by taking out the one you don’t like ‘just because’ and then say “my candidate is the only one that can win.”
Anybody can pull a wish out of their but and call it a rose, but that does not a rose make.