By Tony McVeigh, Kentucky Public RadioKentucky’s U-S Senate race is the main attraction in today’s primary election, but several state Senate seats are also being fought over.Half of the Senate’s 38 seats are up for grabs this year, but only nine Senate districts have primary battles.Senate President David Williams of Burkesville has opposition within his Republican Party.Four Republicans and two Democrats are vying for the seat now held by Senate Minority Leader Ed Worley of Richmond. Two Democrats and two Republicans want the seat held by Sen. Gary Tapp of Shelbyville. Tapp and Worley are retiring.Republican Senators Tom Buford of Nicholasville, Ernie Harris of Crestwood, Alice Forgy Kerr of Lexington and Julie Denton of Louisville all have primary opponents, as does Democratic Sen. R-J Palmer of Winchester.