(CNN) - Kentucky Secretary of State Trey Grayson has conceded Kentucky’s Republican Senate primary to Rand Paul.
"We must unite behind Dr. Paul," Grayson said, adding, "We have more things that unite us."
CNN earlier projected Paul, the son of Republican Rep. Ron Paul of Texas, as the primary's winner.
With 49 percent of precincts reporting, Paul led Grayson 59.6 percent to 35.6 percent.
On the Democratic side, also with 49 percent of precincts reporting, state Attorney General Jack Conway led Lt. Gov. Daniel Mongiardo 48.2 percent to 39.7 percent.