Boot him. Now. It’s the right thing to do, and his replacement is likely to be a stronger candidate in 2010, even if Burris isn’t in jail by then.
* Footnote A puzzled query from a reader shows me that I have committed the sin of in-joke. “From hunger” is an expression (I think originally Yiddish) meaning “Chosen only out of desperation.” I was playing on, e.g., D-CA, which is read “Democrat from California.”