Mehmet Oz says John Fetterman is Bernie Sanders 2.0. How similar are they?

Mehmet Oz has a recurring nickname for his Democratic Senate opponent: Bernie Sanders.

As the general election campaign enters its second full month, Oz, the Republican nominee, along with members of his party, have increasingly tried to connect Lt. Gov. John Fetterman to Vermont Sen. Sanders in fund-raising emails, press releases, and digital ads.

“John Fetterman will befriend Bernie Sanders in the Senate,” Oz tweeted last week. “He will follow Bernie’s lead and be his sidekick. PA and America cannot afford to have another ‘Bernie’ in the Senate.”

Republicans have...