The aging rocker, who endorsed Mitt Romney, made controversial comments about President Barack Obama that were later denounced by the Romney campaign. NBC’s Andrea Mitchell reports.>> federal investigators are trying to figure out whether ted nugent is a loud mouth or a dangerous loud mouth . it's what the former rock musician said in support of mitt romney that got him an apoirment to talk to the feds at the time when romney is trying to win over conservative republicans. we get the report tonight from andrea mitchell . >> he's a gun loving rocker, the south styled motor city...