Booker, making reference to founding forefathers writing the constitution, said, "Every generation has labored to make us a more perfect union."
His speech is driving home a theme of "stronger together."
"Patriotism is about loving your country. But you can't love your country without loving your countrymen and women"
Senator Booker on what he thinks makes America great.
Booker said Hillary Clinton knows debt-free college is not a gift but an investment.