issue-oriented campaign debating the major issues. >> reporter: sources close to biden are staying tight lipped. he was on vacation in south carolina. the former chairman of the state's democratic party was in discussions that state biden is taking a hard look at this. thank you. republicans pouncing on hillary clinton after the frontrunner made a joke about snapchat. a message service that the message disappears. she made a joke about snapchat. i love it, she said to a fund-raiser in iowa. republicans saw that as an opportunity to blast hillary clinton. she dismissed suggestions she was taking the con controversy too lightly. >> most importantly, i never sent classified e-mail or never