Marco Rubio is getting squashed tonight. His downfall was Chris Christie calling him out on reciting memorized, stump answers, which would have been less of a moment had not Rubio continued to use the same lines even afterwards.
Once again he was just asked to defend himself and his immigration bill. Once again, he answered with the same sentences about Barack Obama "knowing what he is doing." That's the fourth time this debate he's answered with the same stump response.
It's not pretty to watch. I don't think even the most generous of pundits will be able to praise Rubio for this performance.