Kennedy scion Jack Schlossberg — JFK’s only grandson — is continuing to test the waters when it comes to a potential congressional run.

The dashing Democrat and son of Caroline Kennedy was spotted rubbing elbows and shaking hands at the Carnegie Hall Opening Gala this week amid guests like Edie Falco, Fran Lebowitz, Lena Hall, Cynthia Rowley and Candace Bushnell.

One spy tells us Schlossberg, who’s known for his zany and over-the-top social media posts , seemed “subdued, different than his Internet personality.”

Another source told us, “He worked the room and people were eating him up. He was polished. It wasn’t ‘Wild West.'”

A political insider tells us that gauging interest at this event is part of the game.

“Carnegie is a block party for the city’s culture class,” the source e

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