As a dangerous winter storm threatens more than half of the United States with heavy snow, crippling ice, and brutal cold, Morgan Norwood reports from Dallas, Lee Goldberg tracks the system and Whit Johnson has the latest on travel and flight cancellations; in Minneapolis, Matt Rivers has details on the massive city-wide protest against ICE underway with more than 20,000 braving the brutal cold; four days after Indiana Hoosiers quarterback Fernando Mendoza won the national championship, David