Christie is an ass. He took out Rubio for no apparent reason. If Trump makes him VP we will have two RINO’s on the same ballot, distinguishable only by body mass.
It was a last-chance, desperation move. It must have looked sensible to Christie, considering that Rubio was doing well in the polls, but now it looks like somebody should have gone after Kasich as well for Christie to get any benefit from the attack.
I read that Christi took Rubio out because a Rubio pac was running a massive number of negative ads against Christi.