Republican Rep. Sam Graves of Missouri, chairman of the House Transportation and Infrastructure Committee, announced Friday that he won’t seek reelection, joining a wave of retirements ahead of the midterm elections. Graves, 62, has represented a solidly GOP and rural northern part of Missouri since 2001. Just last month, he filed for reelection in what would have been a campaign for a 14th term. But he said in a social media post Friday that he’s “making room for the next generation.” So far,