Democratic Insider and a Republican Backed by Trump Win Ohio House Races

The victories by Shontel Brown, a Democrat supported by the national establishment, and Mike Carey, a Republican endorsed by Donald Trump, provided a lift to the leadership of both parties.

A Democratic candidate backed by the party establishment and a Republican endorsed by former President Donald J. Trump won two primary races for open House seats in Ohio on Tuesday, an assertion of dominance for the leadership of both political parties as they face questions over unity in their ranks.

In a Democratic primary in northern Ohio, Shontel Brown, who...