On Tuesday night, Ohio, Indiana, North Carolina and West Virginia Republicans held primaries for key Senate, House and/or gubernatorial races. And in many of the most important elections, a problematic, inexperienced, or oddball candidate faced off against a more experienced, mainstream, convention candidate (or set of candidates).

These matchups likely rattled insiders on both sides of the aisle. In the 2016 presidential primaries, Donald Trump (a political novice) won the GOP nomination and Bernie Sanders (who wasn’t even a Democrat) made a solid run at the Democratic nomination. It’s easy to see how more-conventional politicians would get a little nervous.