Ben Carson begins first t.v. ads in key states. (NBC News)
Clinton regains lead in Iowa poll. (Bloomberg Politics)
Lincoln Chafee to address the future of his campaign today. (New York Times)
Documents: Arizona tried to illegally import execution drug. (AP)
NJ lawmakers override a Chris Christie veto for the first time--on a gun bill. (NJ.com)
Probe faults EPA for mine spill. (AP)
What are you reading this morning? Let us know in the comments, please.