John Bresnahan has an excellent article about efforts to get Joe Wilson to apologize, including this nugget:
House Minority Leader John Boehner of Ohio and other Republicans also privately asked Wilson to make an apology on the floor, but he wouldn’t comply, according to GOP insiders.
We’ve reached a stage where the Joe Wilsons and Michelle Bachmanns of the world are more beholden to Glenn Beck and the tea baggers than their own party leaders. The good news is that this weakens the Republican party. The bad news is that it creates a self-contained pocket of complete craziness in Washington that could do a lot of damage under the right circumstances.