I think he delivered a stronger, more forceful rebuke than he did on Letterman. You can tell he is salivating at the prospect of exploiting this on stump speeches and the debate. My takeaway from his rebuke - to paraphrase - "There are people who abuse the tax system at the bottom, but there are also some who abuse the tax system at the top."
UPDATED: with more accurate quotes:
“When you express an attitude that half the country considers itself victims, that somehow they want to be dependent on government,” Mr. Obama said, “my thinking is, maybe you haven’t gotten around a lot.”
Mr. Obama’s comments were his most extensive, and barbed, response to Mr. Romney’s comments, which were videotaped at a Republican fund-raiser in Florida. The president acknowledged that some people abused government largess, but he noted that “there are a bunch of millionaires who aren’t paying taxes.