paso and dayton. beto o'rourke missing the town fair to help his home town heal. julio castro claiming racism is a key issue. >> the president has brought this environment that has given rise to white nationalism. >> reporter: against an otherwise colorful backdrop, stern rebukes of president trump. >> we expect more out of our pre-schoolers now than we do the president of the united states. >> reporter: at a dinner put on by iowa democrats on friday night, joe biden weighed in. >> donald trump offers no moral leadership. he has no interest in unifying the country. >> reporter: five months from the iowa caucus, the tenor of this election serious. >> we need background checks. >> reporter: kamala harris on a campaign bus tour across the state. >> i think the american people are right to say look enough of the words. show me action. >> reporter: new polling shows a