Al Franken, the Democrat from Minnesota who won election to the Senate after a successful career as a comic and author, has begun to show the sharp-tongued side of his personality by ripping into GOP staffers behind the scenes. Franken has worked diligently to keep a low public profile in Congress while focusing on wonky policy debates. But he has been unable to completely repress the fiery passion that made him a hero of the Democratic Party’s liberal base. Franken has teamed up with GOP colleagues to introduce a variety of legislation, something that may surprise fans who read his...