President Donald Trump heads Monday to Mississippi, as he continues a closing midterm campaign blitz that highlights Republicans' challenges ahead of an election that could drastically shift power in Washington and statehouses across the country.

Vivek Ramaswamy’s dirty political schemes are making history. The Ohio Republican gubernatorial nominee’s boorish ad campaign against Democratic candidate Dr. Amy Acton has inspired one of Ohio’s oldest newspapers, the Cleveland Plain Dealer, to break company policy in Acton’s favor. The paper had stated a few months ago it would not make political endorsements, including in the governor’s race. But on Sunday, its editorial board published a...