He says Clinton would measure America's greatness not by the number of millionaires and billionaires, but by how few people are living in poverty.
[Ads /]
"Hillary knows when workers make a fair wage, it doesn't just help their families, it builds a stronger, more durable economy that expands opportunity and makes all of us Americans wealthier," Booker said.
Booker says the country doesn't always have to agree, but the U.S. can't became a place "where our highest aspiration is that we just tolerate each other."
"We are not called to be a nation of tolerance, we are called to be a nation of love," he said.
** Watch the Booker's full speech in the video player above (note: it's 20 minutes long) **
He said the country cannot be seduced into cynicism about our politics.
"Here in Philadelphia, let us declare again that we will be a free people. Free from fear and intimidation," Booker said. "Let us declare again that we are a nation of interdependence, and that in America love always trumps hate. Let us declare, so that generations yet unborn can hear us. We are the United States of America; our best days are ahead of us."
[Ads /]
Booker also champions debt-free college, which he says represents the best of the Democratic party.
The Associated Press contributed to this report.