CORAL GABLES, Fla. (AP) -- Mocking his Republican rival, President Barack Obama says Mitt Romney once described himself as "severely conservative." But these days, Obama says Romney is trying to convince voters he was, in Obama's words, "severely kidding."
Obama says Romney is trying to mask his past stances on tax cuts and health care.
Obama's critique follows last week's debate between the two candidates and signals a new aggressiveness by the president on the same day that Vice President Joe Biden and Romney running mate Paul Ryan were getting ready to debate.
Obama says Romney will "rubber stamp" a conservative economic agenda. He says Romney's more moderate image amounts to "an extreme makeover."
Obama spoke Thursday at a rally at the University of Miami in Florida.