I’m not surprised.
In the first place, he has two defenses, nicely summarized by links on Drudge:
1. What he said was true. Obama did lie.
2. The Democrats behaved much worse at Bush’s State of the Union speech, and nobody criticized them.
Finally, as already noted, the more attention his “You lie” gets, the worse Obama looks. Because a lot of people have started to notice that he does, in fact, habitually lie—especially about health care.
"to bring to a standstill; render unable to proceed or go back"