Donald Trump has 24 percent support, and Dr. Ben Carson, who led two other polls in the past week, is at 23 percent
A new Republican presidential poll by Quinnipiac University shows a virtual tie at the top. Donald Trump has 24 percent support, and Dr. Ben Carson, who led two other polls in the past week, is at 23 percent. Sens. Marco Rubio and Ted Cruz are next. Major Garrett reports.