(The Center Square) – U.S. Sen. Ted Cruz’s campaign filed a complaint late Thursday with the Federal Election Commission alleging that his Democratic challenger was coordinating with the Democratic Senatorial Campaign Committee on television ad buys in violation of federal law. U.S. Rep. Collin Allred, D-Dallas, is challenging Cruz, a Republican running for reelection to his third term. Cruz, a constitutional scholar who clerked for federal judges, including the late former U.S. Supreme Court Chief Justice William H. Rehnquist, is being challenged by Allred, a former NFL football player. Cruz …