Al Franken is liable to surprise and disappoint a lot of people who expect him to be the cut-up of the Senate Class of 2008.

That applies both to liberals who would like to see him unsheath the rhetorical sledgehammer he often applied to conservative icons such as George W. Bush, Rush Limbaugh and Anne Coulter, and to conservatives who envision Franken reverting to shtick and embarrassing the Democrats in Washington and back in Minnesota.

The clue here is the very sober demeanor that Franken projected virtually throughout his Senate campaign, his first bid for public office after many years of backing liberal causes.