Jill Biden: I've seen Joe's character in his optimism ... Joe always works to give people a sense of hope - live video
Former US Rep. Gabrielle Giffords on stage at Democratic National Convention to deliver Pledge of Allegiance
Actress Scarlett Johansson: Why are we only speaking with half our voice when so many issues at stake here directly affect us? - live video
Vice President Joe Biden is nominated by acclamation at Democratic convention - live video