Ron Paul’s campaign announced today that the campaign’s ad lambasting Rick Perry for serving as Al Gore’s state chair during the 1988 election will air twice during tonight’s debate. Ad:

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Perry campaign spokesman Mark Miner highlighted a letter Paul had written in 1987 resigning from the GOP because of his dislike for how Ronald Reagan was leading the party. ”The Republican Party has not reduced the size of government. It has become big government’s best friend,” Paul wrote. “There is no credibility left for the Republican Party as a force to reduce the size of government. That is the message of the Reagan years.”