WASHINGTON – Democratic Sen. Al Franken has taken the unusual step of shutting down Sen. Joe Lieberman on the Senate floor. Lieberman, a Connecticut independent, currently is the target of liberal wrath over his opposition to a government-run insurance plan in the health care bill. Franken was presiding over the Senate Thursday afternoon as Lieberman spoke about amendments he planned to offer to the bill. Lieberman asked for an additional 30 seconds to finish — a routine request — but Franken refused to grant the time.