He’s not used to being challenged
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He looked like he was being scolded during the debate. He was trying to comeback with untruth and it was not working.
Having had to stand there for the full time with a back and forth exchange is not his style. He was not able to turn and walk away from it.
He was not in command of the situation which put him defenseless using his normal tactics.

When he debated in the 08 election he did not have a record to defend. Up until his presidency he kept himself clean of any debateable record.
It is a different ball game now.

His lapdog media buddies have kept him in a bubble where he was insulated from his past and his record, where he never had to face the tough questions or harsh criticisms that Romney pounded him with for an hour and a half.
McCain said if it was a fight they would have had to stop it.
It was an ass-whoopin'.