CHARLOTTE, NC (CBS) -- Democrats swooned for first lady Michelle Obama and marveled at a young mayor from Texas. And today, President Bill Clinton makes a return to the big stage.

Michelle Obama had everyone on the convention floor on their feet and some had tears in their eyes, as mrs. Obama spoke passionately about her husband. She said in her speech, "I have seen firsthand that being president doesn't change who you are, it reveals who you are."

She says this president is a man whose upbringing and family values means he'll look out for all Americans. She said, "When it comes to rebuilding our economy, Barack is thinking about folks like my dad and like his grandmother." She also said, "That's why he cut taxes for working families and small businesses and fought to get the auto industry back on its feet."

While the first lady mostly stayed away from politics, keynote speaker Julian Castro dove right in. He got the crowd here fired up when he answered the question: are we better off now than we were four years ago? He said, "Four years ago, America stood on the brink of a depression. Despite incredible odds and united Republican opposition, our president took action, and now we've seen 4.5 million new jobs."

Castro also made a pitch to Hispanic voters. He said, "Because he knows that we don't have an ounce of talent to waste, the president took action to lift the shadow of deportation from a generation of young, law-abiding immigrants called dreamers."

Tonight, President Bill Clinton will be the star. Oregon delegate Matt Keating says, "They have Clint Eastwood, we have the Clintons. I think we win."

He's expected to share how he got the economy rolling and why he believes President Obama can do it as well. North Carolina delegate Jean Farmer-Butterfield says, "A lot of people respect President Clinton for what he did as a president. And indeed, when he left office, the economy was in a far better condition than it was when he took office."

For those watching at home, President Clinton will have to compete with the start of the nfl season.

Michelle Obama will continue her pitch to get the democrats excited. She's expected to speak to several democratic groups in charlotte this morning. And President Obama will arrive in charlotte today to prepare for his speech tomorrow.