Obama's Debate Refrain - "He's A Liar!!

It looks like Obama's strategy during this second debate is to continuously counter any of Romney's pints and claims by calling Romney a liar. “What Governor Romney said is not true!”

In the first 20 minutes of the debate Obama has made that accusation 5 times. It doesn't seem to matter that Romney can back up his assertions with facts gleaned from government sources.
It looks like that's about all Obama's got left.

Update 9:43PM: I have been checking the blogs while listening to the debate on the TV in the other room. I realized that Obama was almost yelling, getting angry, his voice shrill while Romney has maintained his cool. I bet that isn't helping Obama at all.