WASHINGTON — Lefty California Rep. Ro Khanna has told The Post that socialist New York City Mayor-elect Zohran Mamdani is too radical even for him on at least one major issue — his commie economics. Khanna, a self-described “progressive capitalist,” said in an exclusive interview Monday that Mamdani went too far by expressing support for “seizing the means of production” as recently as 2021 and claimed he “strongly disagreed” with the notion. “I believe, obviously, in innovation and free