Sen. Ted Cruz of Texas won the Kansas Republican caucuses on Saturday, notching another victory in his drive to slow the momentum of front-runner Donald Trump. The Associated Press declared Mr. Cruz the winner. With 53% of precincts reporting, Mr. Cruz had 49% of the vote, followed by Mr. Trump with 24.7% and Sen. Marco Rubio of Florida with 14.8%. Ohio Gov. John Kasich had 9.9%. Kansas awards 40 delegates proportionately based on statewide and congressional district returns, but only to candidates who earn at least 10% of the vote. The party's top GOP officeholders were split over the candidates. Mr. Rubio was endorsed by Gov. Sam Brownback, Sen. Pat Roberts and Rep. Mike Pompeo. Mr. Cruz was endorsed by conservative Rep. Tim Huelskamp, and Kansas Secretary of State Kris Kobach endorsed Mr. Trump.