president needs latinos to turn out for him on election day. for their keynote speaker, democrats chose san antonio mayor, julian castro. like the president, castro was raised by a single mom, went to harvard law, and now an up and comer in the democratic party. >> my mother fought hard for civil rights so that instead of a mop, i could hold this microphone. >> reporter: castro said the republican ticket just doesn't get it. >> we all understand that freedom isn't free. what romney and ryan don't understand is that neither is opportunity. we have to invest in it. >> reporter: tonight's main event, former president bill clinton. his speech is aimed at those 2008 obama voters who are unhappy, but they're undecided now and might be persuadable. rob, paula. >> all right, karen. i heard somebody say regarding the first lady's speech and whether she got the job done. she said i love barack more now than four years ago. the problem