He said this fall's elections are "a referendum on the very identity of our nation." The crowd responded with "whoa!"
As we reported earlier, Rubio is challenging Gov. Charlie Crist in the GOP primary. He didn't mention his Republican rival - who is not attending CPAC - but quipped, "a long list of early establishment endorsements will not spare you a primary."
Rubio said he wants to abolish taxes on capital gains, interests and "death."
He also said conservatives want their children to inherit their "hopes and dreams."
Follow our live updates from CPAC on our wire here.