California's Proposition 50 could reshape congressional districts while New York City voters will decide on election timing and affordable housing measures.

As Zohran Mamdani turns from campaigning to governing, a source close to the mayor-elect told ABC News he is intent on reaching out to New Yorkers who did not vote for him and send a strong signal that he plans to be a mayor for all New Yorkers.

The aggressive gerrymander could help Democrats flip as many as five House seats next year. While that could neutralize new maps in Texas, Republicans are redrawing more district lines elsewhere.

California voters passed Prop. 50, redrawing the congressional map and sparking lawsuits from California Republicans, while Governor Newsom encourages other states to follow suit.

NBC News' Gary Grumbach reports on the key election results to watch for, from the race for New York city mayor to the vote on California's congressional redistricting plans. He also spoke exclusively to DNC Chair Ken Martin about the upcoming elections and his party's plans to gain control back of Congress in 2026.

Republicans asked a federal court to block newly approved maps in California that were designed to flip as many as five House seats for Democrats.

Los Angeles, New York City and San Francisco build housing at some of the slowest rates of major cities in the country. Over the past decade, New York City added just 30.6 housing units per 1,000 residents — far fewer than Atlanta or Miami’s roughly 140 housing units — according to NYU’s Furman Center data.

California has the highest state income tax rate in the nation for the wealthy – 13.3% for incomes of $1 million and above. But the state also has very progressive tax brackets, and studies have found that people with lower and middle class incomes tend to pay at rates competitive with many other states.

Gavin Newsom accuses Trump of ‘rigging mid-terms’ as California approves redistricting measures to help win back the House