City Councilman Chi Osse is all but certainly giving up his challenge of Brooklyn Congressman Hakeem Jeffries in next year’s congressional elections after members of New York City’s Democratic Socialists of America chapter voted against offering Osse the group’s endorsement on Saturday.

The vote — which had 52% of members voting against an endorsement, 46% in favor and 2% abstaining — is a relief for Mayor-elect Zohran Mamdani, a DSA member who directly urged the group to not endorse Osse.

If the DSA had defied Mamdani and voted to endorse Osse, an awkward rift could have developed between the incoming mayor and the influential left-wing group just as he prepares to take office Jan. 1.

Late Saturday night, after the vote came in, Osse signaled to the Daily News he’s likely not g

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