In case you didn't catch it, one of Obama's assertions that his opponents were lying was met with a shouted "you lie!"
Reportedly, the shouter was Rep. Joe WIlson, R, SC. I would not say he was rabble-rousing. It is a well-accepted rule of logic that a gratuitous assertion may be equally gratuitously denied.
UPDATE: I read that Sen. McCain has called on Rep. Wilson to apologize for calling the president a liar. I assume he will also be calling on the president to apologize for repeatedly calling his critics liars.
UPDATE #2: Wilson has apologized. Will Obama?