Joe Biden was on the campaign trail in New Hampshire Friday, which means that the potential for a new gaffe to add to his growing repertoire was high.While speaking at a health care town hall at Dartmouth College in Hanover, the Democratic front-runner did not disappoint.Biden, who is considered the Democrats' most electable candidate, hit his first snag while trying to describe his healthcare plan: “For folks in the working class that are below 400, they will, in fact, increase their premiums,” he stammered, adding quickly, "excuse me, will increase the generosity of the premium tax cut that they now...