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Carson tops Trump in Iowa again and other headlines

Morning headlines: Carson beats Trump in Iowa in 2nd poll, Arizona tried to illegally import execution drug, EPA faulted for mine spill.

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. (

Probe faults EPA for mine spill. (AP)

What are you reading this morning? Let us know in the comments, please.