I am shocked as well. I could understand him saying he would support whichever Republican won the nomination, but gave his endorsement to someone else (ANYONE else!) for the moment. Or heck, even saying he will NOT endorse anyone and simply support the Republican whomever wins the nomination. But THIS is surprising, to say the least.
I am sure he thinks that Rudy is the only one who can stop Hillary, and that this is the lesser of two evils..