>> i think they work. and i said, especially if i wear a mask and it opens up baseball, concerts, nfl football, i'd rather wear the mask and go to the game. >> if the president wore one, it would just set a good example, he'd be a good role model. >> reporter: today, i asked biden what he would tell americans. the response to this pandemic has become very politicized. even wearing a mask has become political. if elected, how are you going to get americans on the same page? >> i think we have to start appealing to the better side of human nature, by pointing out that that mask is not so much to protect me, it's to protect you against me. it's to protect other people. and it's called patriotism. it's called responsibility. >> reporter: now, biden says he wishes he could be out meeting with voters, but for the sake of the common good, he will not be holding campaign rallies. that's a stark contrast with the president, who plans to celebrate the fourth of july at mt. rushmore with thousands of