"Faced with a wealthy challenger who has spent millions on television and radio ads," Sen. Jon Kyl (R-AZ) has "asked election authorities to exempt his campaign from federal fund-raising limits," according to the Arizona Republic.
"The problem is, Kyl and Pederson are not yet officially opponents because they have not yet been nominated in their respective Sept. 12 primary elections, although neither has a primary opponent. That has allowed Pederson to spend over $4 million of his own money against Kyl so far without triggering the amendment."