Ron Paul has endorsed Rep. Paul Broun's (R-Ga.) Senate campaign, giving Broun a key bit of credibility with libertarian-minded voters in what is expected to be a crowded GOP primary.

“Paul Broun and I worked together in the House to bring some necessary oversight to the Federal Reserve," Paul said in a statement provided by the Broun campaign. "I endorse Paul Broun on his candidacy to the U.S. Senate.”

Broun is set to face as many as three other Republican members of the state's congressional delegation in the primary, though the field is just taking shape. Broun has a very conservative voting record, and some party leaders worry that he wouldn't be electable in the general election -- a problem Paul himself has confronted.

Sen. Saxby Chambliss (R-Ga.) announced his retirement earlier this year.