. >>> and hillary clintoseems to have switched into higher gear, a fired-uplinton addressed large rallies in iowa yesterday, saying she knows many in the crowd are still shopping for a candidate. and although she's fallen behind in the latest poll, clinton has toned down her attacks on rival bernie sanders, focusing them instead on the republicans. >> you can't be shooting off your mouth when you're the president t of the uted states, you need to be careful, you u say. >> meanwhile, her rival bernie sanders is playing to packed houses. last night the senator got hot. yeah, he took off his shirt. and not only he took it off, he threw straight into the arms of a teenaged fan there. he joked that was all that was coming off. of course, his fans roared. >> thankfuy. >>> now, former new york m mayor michael bloomberg is weighing a third-party run. abc news has learned that he's concerned that donald trump, ted cruz or bernie sanders would be nominated and he would pitch himself as a nonpartisan problem solver. his decision will come after super tuesday, so, we're talking in early march. >>> le