Democrats have taken to Twitter to condemn Rep. Joe Wilson's (R-S.C.) outburst that interrupted President Barack Obama's address to Congress Wednesday night.

The South Carolina Republican shouted "you lie!" when Obama said that his health reform plan would not insure illegal immigrants.

Sen. Claire McCaskill (D-Mo.) said Wilson "behaved like a jerk" but did not mention him by name: 

Biggest disappointmnt of evening, the total lack of respect shown by one member for the President.Never acceptable to behave like a jerk.

Rep. Steve Israel (D-N.Y.) did identify Wilson as the heckler:

"You lie" yeller was Rep. Joe Wilson. Shameful.

The Democratic National Committee tweeted:

Note to @CongJoeWilson: the minimum age for the House of Representatives is 25. Act like it.

UPDATED [11:17pm]

Rep. Jason Chaffetz (R-Utah) is the first Republican lawmaker to chime in on Twitter:

Joe Wilson did the right thing by apologizing for his remark.....