Joe Biden will be sworn in as the 46th president of the United States today. Among Democrats, there is a sense of joy and hope, but also of caution and concern.We speak with a range of Mr. Biden’s supporters, including activists who had originally hoped for a more progressive ticket and longtime fans who embrace his moderation.Guests:Jennifer Medina, a national politics reporter for The New York Times.For an exclusive look at how the biggest stories on our show come together, subscribe to our newsletter. You can read the latest edition here.Background reading: Urging unity, Mr. Biden has tried to focus on his policy plans. But many of those who elected him are still fixated on his predecessor.Mr. Biden’s long career in public office spanned eight presidents. Now, at 78, he will join their ranks.For more information on today’s episode, visit nytimes.com/thedaily