SIOUX CITY, Iowa — The Republican presidential race here in Iowa split into eastern and western fronts on Saturday. Donald Trump flew into the east, by the Mississippi River, appearing in Dubuque and Davenport. Ted Cruz and Marco Rubio went west, to the Missouri River, with stops in Sioux City and Council Bluffs. The western stops were just part of very long days for Cruz and Rubio, and they illustrated the degree to which each man believes it’s necessary to knock down the other, even as Trump continues to lead the race.

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