If Rubio didn't go for that reason.......then he has no business running for the President's office. I can promise you that America's TRUE ENEMIES make Levin and Co look like amateurs...so if he can't handle the heat there...I have no reason to believe he can handle the heat in the White House.
Levin & company represent conserva-cuck central. They hype up abortion then rape us with trade and immigration policies that are destructive. These people must be crushed too if America is to survive.
Why go to an event where there is not even a pretext of objectivity? Add to that very few people will see it and the only thing you would be doing is giving Levin credibility and it becomes a no-brainer. Rubio would be better served going to another rally.