Mudslinging has been a part of political campaigns for as long as anyone can remember. But the U.S. Supreme Court decision to allow unlimited amounts of money to be given to super PACs thrust mudslinging into overdrive. Super PACs have already spent nearly $60 million on the 2012 presidential race. And most of that money has gone into negative advertising. This was underscored in last month’s Florida primary. In the final weeks, 92 percent of campaign commercials were negative. Diane and her guests will talk about attack ads in the presidential race and whether they’re harming the political process.