nbc bay area's laura malpert is live where joe biden delivered the keynote address. i've got to think hillary clinton's win in south carolina is going to be a hot topic there. >> reporter: absolutely. it is not on the official agenda but it is still center stage. a very exciting day here, peggy. take a look here behind me. vice president joe biden is still speaking. he is wrapping up his keynote address to a very energetic crowd that has a lot at stake here. thousands of democrats pack the san jose convention center to hear biden motivate skin spire with the presidential nomination and the u.s. senate seat before voters california democrats have a lot to gain or lose. a heckler disrupted biden off the top of his speech but was quickly escorted out by security. biden started offsinging his fellow democrat's praises then took jabs at republicans in washington, talking about the u.s. being the epicenter of energy around the world, urged voters to unite and warned they have a long, important battle ahead of them. >> let me start by giving our republican friends not so mu