On NBC's Meet the Press , Chuck Todd asked White House Chief of Staff Denis McDonough if that could possibly mean Obama would endorse Hillary Clinton over Bernie Sanders. The Vermont senator voted for a 2005 bill that protects gun manufacturers and dealers from liability lawsuits and against the Brady Bill, mandating background checks for gun purchasers. McDonough denied this interpretation of Obama's words."We'll do exactly what has been done in the past, which is when the nominee is set, then the president will be out there," McDonough said. "This isn't only about the [presidential] primary. We've got a third of the Senate that's running, we've got all the House that's running, we've got state houses and governorships across the country where this is going to be an issue on the ballot."Clinton has, however, received a couple of notable endorsements over the weekend. Former Representative Gabby Giffords, a gun control activist since the mass shooting that nearly took her life in 2011, is reportedly set to announce her support of Clinton this week.Meanwhile, Lena Dunham has been in Iowa campaigning with fashion as well as words: