• Romney steady, Gingrich flat in GOP debate
• GOP candidates trade blame for housing collapse
• Byron York: In Florida, ugly Republican fight gets even uglier

JACKSONVILLE, Fla. — Early Thursday morning — about 12 hours before the final debate of the Florida primary — Newt Gingrich was filled with indignation about Mitt Romney’s investments. In the most recent debate, in Tampa, Romney had hit Gingrich hard over Gingrich’s consulting deal with Freddie Mac. But in the intervening days, Gingrich had learned that not only did Romney have campaign surrogates who actually lobbied for Freddie and Fannie — he also had personal investments in the two mortgage giants.