TOPEKA, Kan. (AP) — Kansas voters will decide several races in Tuesday's primary, choosing their candidates for a U.S. Senate seat and two U.S. House seats. Polls opened at 7 am across Kansas, and state election officials are reminding voters that they'll need to show a valid photo ID in order to vote. The marquee race involves incumbent Senator Pat Roberts facing off against tea party challenger Milton Wolf. And for U.S. Congress, incumbent Mike Pompeo is being challenged by former U.S. Representative Todd Tiahrt in the state's 4th Congressional District, while 1st District incumbent Tim Huelskamp is being challenged by Alan LaPolice. Statewide office primaries also include races for governor, insurance commissioner and secretary of state.