LOUISVILLE, KY (AP) - Rand Paul says his win in the Republican primary for Kentucky's U.S. Senate nomination is a "tremendous mandate for the tea party."
Paul has beaten Republican establishment favorite Trey Grayson.
The victory gives a tea party activist a key win in a statewide election that could embolden the fledgling political movement in other states.
Paul is the son of former presidential candidate U.S. Rep. Ron Paul.
An eye surgeon in Bowling Green, Paul had never before run for office.
He turned to the Internet fundraising model used by his father to pay for his campaign.
Grayson stayed competitive by drawing heavy financial support from traditional GOP donors inside Kentucky.