This incident was most unfortunate. I sure I am glad the congressman wasn't from Georgia. -- In Lawmaker’s Outburst, a Rare Breach of Protocol

Representative Joe Wilson of South Carolina, pictured here pointing at other Republican members of Congress, received criticism for yelling, “You lie!” at the president.

From the New York Times:

It was a rare breach of the protocol that governs ritualistic events in the Capitol.

In an angry and very audible outburst, Representative Joe Wilson, Republican of South Carolina, interrupted President Obama’s speech Wednesday night with a shout of “You lie!”

His eruption — in response to Mr. Obama’s statement that Democratic health proposals would not cover illegal immigrants — stunned members of both parties in the House chamber.

Mr. Wilson . . . phoned the White House and reached Mr. Emanuel, who accepted an apology on behalf of the president.
_______________

And this wasn't all. See the Washington Post, noting that while the majority of both parties' lawmakers behaved as adults, the insolence by House GOP members stole the show.
_______________

And the Wall Street Journal reported a hour or so after the outburst that "'Joe Wilson" is currently the number one search item on Twitter, and fellow Republican and Arizona Sen. John McCain called his comment 'totally disrespectful' . . . ."