florida is a big prize, with 50 delegates up for grabs in a winner-take-all contest. it s time to turn to cnn political reporter peter hamby who s live in plantation, florida, a suburb just west of ft. lauderdale. reporter: they are not letting up on newt gingrich. i ve got to tell you, every television ad i ve seen has been negative and most of them have within negative from romney or his allies against newt gingrich. today they re out with a brutal new ad that s sat rating air waves here. it features tom brokaw talking for 30 seconds in a news clip from 1997 after the house voted to sanction gingrich when he was speaker. take a look at this ad that s running here, gary. tonight he has on his own record the judgment of his peers, democrat and rip alike, by an overwhelming vote they found him guilty of ethics violations. they charged him a very large financial penalty and they raised several of them raised several questions about his future effectiveness. reporter: so