The Democratic candidates were out in force in Iowa on Sunday with the caucuses just 29 days away. A new CBS News poll found that while 14 candidates remain in the race, Iowa voters seem most interested in just five of them. There is a three-way tie for first in Iowa, with Bernie Sanders, Joe Biden and Pete Buttigieg on top. Elizabeth Warren is fading and Amy Klobuchar is bumping up. Ed O'Keefe reports.