Daily Roundup

* Does Romney have Iowa locked down? - Politico

* Fired McCain aides may be hired by Thompson - NY Sun

* An underwater fence to stop invasive species - Washington Post (will it work against illegal aliens?)

* Cindy Sheehan considers run against Pelosi - AP

* Scouting the Hill on Iraq - Robert Novak

* Santorum lashes out against GOP Iraq defections - MSNBC

* Giuliani jeered for opposing flat tax - Fox News

* Bush goes after Dems in Congress - USA Today

* Conyers to start Libby witchhunt - USA Today

* Novak speak out on Plame Leak - Outside the Beltway

* Impeachment drive gains steam - Michelle Malkin

* Hold on to your wallets - Sister toldjah