Republican operative Shermichael Singleton got into a heated back-and-forth with Democratic operative Maria Cardona over who deserves more blame for America’s broken immigration system. During an appearance on CNN, Cardona argued that Republicans had squandered whatever advantage they had on immigration when they torpedoed their own bipartisan compromise bill that would have enacted the toughest immigration restrictions seen in decades. This caused Singleton to object. Want more breaking political news? Click for the latest headlines at Raw Story. “On the immigration front, you guys had two ye…