Weigel speculates:
... once ensconced in the Senate, Franken will likely eschew the racier, angrier jokes that gave him political trouble and become a harder target for Minnesota Republicans, and barely a target at all for national Republicans. It’s not like he’ll become a cultural lightning rod like Rick Santorum or Katherine “Queen Esther” Harris Franken’s a conventional liberal, which isn’t a controversial thing to be right now.