Newt Gingrich's Florida Poll Numbers Sagging, Five More Eurozone Countries Downgraded, Facebook to Go Public, Iran Threatens its Own Oil Embargo: P.M. Links

• Newt Gingrich's soft(er) stance on immigration is not helping his poll numbers in Florida.

• The demise of the Eurozone continues; Fitch Ratings downgrades the debt of Spain, Slovenia, Italy, Cyprus, and Belgium.
• Ron Paul challenged Rick Santorum, Mitt Romney, and Gingrich to "a 25-mile bike ride…in the heat of Texas" during last night's debate.
• Facebook is preparing to go public, perhaps by next Wednesday.
• Iran has economic weapons, too. They've threatened to stop exporting oil to Europe, though they're letting U.N. weapons inspectors into the country on Sunday.
• The 10th Circuit Court of Appeals confirms law that says lying about being a war hero is not protected speech.
• A delicious headline for history nerds and Newt loathers alike: "President John Tyler's Grandson says Newt Gingrich is a 'Jerk.'"