Rep. Dr. Ron Paul, R-Texas, has earned the nickname "Dr. No." for voting against anything that hasn't been explicitly authorized by the Constitution.
In 1988, he ran for president as a Libertarian.
Today, Paul is the only GOP contender who wants to withdraw U.S. troops immediately from Iraq.
While Paul, is considered a longshot for the White House, his supporters have helped him set a new fundraising record in December 2007 for the most money raised in a single day via the Internet (slightly more than $6 million).
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