PHILADELPHIA (AP) — Democratic presidential candidate Andrew Yang is fully embracing the underdog plot of his campaign.

He demonstrated that on Tuesday by jogging onto the Philadelphia Art Museum steps made famous by Sylvester Stallone in "Rocky" for a rally.

Instead of a grey sweatsuit, Yang sported a blue jacket and ball cap, declaring that he is seeking the presidency to solve the nation's problems. The biggest problem, Yang said, is "how the heck did Donald Trump become our president?"

Months after launching his campaign, Yang remains near the bottom of most national polls, but his campaign already has fared better than some more traditional candidates. Yang was one of 10 candidates to appear onstage at the last presidential debate. And his campaign has outlasted a sitting U.S. senator and sitting governor.

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