These three-named, 29-year-old Democratic Socialists sure have a way of shaking up city congressional races.

Following in the footsteps of Alexandria Ocasio-Cortez, Staten Island’s Richard-Olivier Marius made waves last week when he signaled plans to target a Democratic incumbent, freshman Rep. Max Rose (D-SI/Bklyn).

“It’s a healthy way to pressure our representatives,” Marius told The Post.

Marius, a former Rose campaign volunteer, is pushing for the impeachment of President Trump.

Rose, one of only two Democrats the district has sent to Congress since 1981, was one of the party’s few impeachment holdouts.

But he joined the Democratic chorus Wednesday — one day after Marius got his first burst of press attention.

“His campaign has nothing whatsoever to do with this,” Rose told reporters after announcing he would support the impeachment inquiry.

Republicans scoffed.

“Now that you’ve caved in record time, can you at least drop the ‘tough guy’ act?” taunted the National Republican Congressional Committee in a tweet highlighting Marius’s candidacy.

But Marius revealed to The Post he is on the brink of suspending his campaign — due, he said, to a conflict with his day job at the Staten Island Chamber of Commerce.

He is pleased his candidacy has apparently spurred Rose to action on impeachment.

“It’s not about the bragging rights,” he said. “When they go to the polls, people should remember that Max Rose is capable of making this kind of decision. Now maybe he’ll have this same courage for other legislation that I think needs to be passed” — like the Green New Deal and Medicare for All.

Rose admitted that his new impeachment stance may come back to bite him in the 2020 general election when Trump — who walloped Hillary Clinton by 17 points on Staten Island in 2016 — will be on the ballot.

“Talk to any political expert and they would not say that what I’m doing right now is the most politically astute thing that I could do,” he said.