Rand Paul, a physician making his first run for public office, won yesterday's Republican U.S. Senate primary in Kentucky. Paul received 59% of the vote, while his main opponent, Secretary of State Trey Grayson, got 35%.
The result is considered a victory for Tea Party upstarts against the Republican establishment. Grayson had been endorsed by senior Republicans, including the state's senior senator, Mitch McConnell, the Senate minority leader.
Rand Paul's father, Congressman Ron Paul, twice ran for president on a libertarian platform.
In a very close Democratic primary, Attorney General Jack Conway defeated Lieutenant Governor Daniel Mongiardo, by 44% to 43%.
Paul holds a narrow lead over Conway, according to polls reported by Real Clear Politics.