President Barack Obama said Wednesday he has seen no evidence that national security was threatened by the widening sex scandal that ensnared his former CIA director and top military commander in Afghanistan. Facing questions from reporters, Obama also reaffirmed his belief that the U.S. can’t afford to continue tax cuts for the wealthiest Americans, a key sticking point in negotiations with Republicans over the impending ‘‘fiscal cliff.’’ He said, ‘‘The American people understood what they were getting’’ when they voted for him after a campaign that focused heavily on taxes. And he defiantly told critics of U.N. Ambassador Susan Rice, a potential candidate to lead the State Department, that they should ‘‘go after me’’ — not her — if they have issues with the administration’s handling of the deadly attacks on Americans in Benghazi, Libya/Ben Feller, AP. More here.