(CNN) — CNN’s Candy Crowley CNN’s Candy Crowley reports that supporters of Bill Richardson in Iowa are now moving over to Barack Obama as their second-choice candidate — a vital designation in the Democratic caucuses. A Clinton source tells her that “The 'Richardson thing’ is real," and that Clinton supporters in the caucuses report “people are moving en masse from Richardson to Barack Obama.”

Obama supporters dispute the reports.

READ MORE: http://politicalticker.blogs.cnn.com/

---