Karl Rove and other leading Republican strategists started American Crossroads, the “super PAC” that has been among the single most powerful forces in national politics. But its pre-eminence is being tested. (Credit Rich Pedroncelli/Associated Press)
By Eric Lichtblau and Maggie Haberman
May 21, 2015
WASHINGTON — For three election cycles, American Crossroads, the brainchild of Karl Rove and other leading Republican strategists, has been among the most powerful forces in national politics, a shadow party that has spent hundreds of millions of dollars on advertising, data and opposition research to help elect candidates.