Zohran Mamdani may not solve all of the beleaguered US Democrats' problems, but the surprise frontrunner in the race for New York mayor does offer hints on how to win back voters and power.

The Democrats -- shut out of power in the White House and both chambers of Congress -- are seen negatively by 63 percent of US voters, according to a July poll in the Wall Street Journal, the party's lowest approval rating in 30 years.

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