Republican presidential candidate Tom Tancredo plans to drop out of the race during an announcement Thursday afternoon in Des Moines, Iowa, GOP sources close to the campaign have told FOX News.

Tancredo, who has aggressively pushed his anti-illegal immigration message throughout the GOP primary race, has not been able to break through in the polls against his better known competitors. He and California Rep. Duncan Hunter typically poll in the single digits behind Texas Rep. Ron Paul in national surveys.
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