Heavy snow snarls traffic in Midwest as millions take to the roads for Thanksgiving

Across the Midwest, the first snowstorm of the season came at the worst time for Thanksgiving travel. Heavy snow fell in parts of Minnesota, North Dakota and western Wisconsin -- as much as 17 inches in some places. Jonah Kaplan reports, and Rob Marciano has the forecast. Then, Kris Van Cleave has more on the millions of Americans traveling by car.