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Bill de Blasio’s win in New York City’s mayoral race has put the Democrat in charge of the nation’s largest city and smack in the middle of the nation’s largest media market — giving him an unmatched platform both to pursue liberal policies and to cause all sorts of headaches for his party’s leaders in Washington.

Mr. de Blasio’s landslide victory made him a hero among liberal activists, who likened him to Sen. Elizabeth Warren of Massachusetts and embraced his campaign promises to raise taxes on the city’s wealthier residents and use the new pot of money to expand government programs and tackle inequality.

Republican strategists already anticipate being able to use the mayor’s stances as a wedge against Democrats running for national office, and analysts said some Democrats may indeed have to spend time defending their left flank.