The Senate race in Iowa is one of the most closely watched this year and the general election matchup is now set, with Democrats hoping for a gain. Iowa is also where President Donald Trump's endorsement streak ended when his pick for governor lost in the Republican primary on Tuesday. Democrats have settled on a nominee in a New Jersey congressional district that could decide which party controls the House after November's elections. But much of the focus on this round of voting has been on California, in races for governor and Los Angeles mayor. Primary elections were also held in Montana, New Mexico and South Dakota.