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The unexpected joy at a Trump rally in Iowa
By Ryan Lizza
Trump wants to run against Bernie over socialism.
By William Saletan
How Does The Iowa Caucus Work?
By Domenico Montanaro
How the Iowa caucuses work - explained with cats
By Ben Kellerman
Super PAC uses heart attack in ad hitting Bernie Sanders
By Maggie Severns & Alex Thompson
Sanders gets the frontrunner treatment - POLITICO
By Holly Otterbein
Trumpworld torn over running against Bernie - POLITICO
By Alex Isenstadt