Summary: Gun control debate is again at the forefront after a tragic Conn. school shooting. Amidst continued fiscal cliff talks, Susan Rice chooses not to pursue the Secretary of State nomination. Plus, the U.S. recognizes the Syrian opposition. Joining Gwen: Reid Wilson, National Journal Hotline; Martha Raddatz, ABC News; David Sanger, New York Times; John Dickerson, Slate Magazine and CBS News.
