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Super PAC uses heart attack in ad hitting Bernie Sanders
By Maggie Severns & Alex Thompson
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
The unexpected joy at a Trump rally in Iowa
By Ryan Lizza
Trumpworld torn over running against Bernie - POLITICO
By Alex Isenstadt