
Voters in three states will cast ballots in competitive primaries on Tuesday, including in pivotal Senate races that will set the stage for the November general election. The race to replace Sen. Ben Cardin, D-Md., who's retiring at the end of the year, is already among the most expensive elections in the state's history – and a majority of the money has been spent on the contentious Democratic primary. In neighboring West Virginia, a GOP Senate primary reflects the deepening battle lines among Republicans in Congress. National debates are also...