CHICAGO (AP) — Chicago Mayor Rahm Emanuel is pledging to take a new approach to a big spike in pension costs, ongoing gang violence and negotiating with unions that spent millions trying to defeat him.

Emanuel won a second term Tuesday over Cook County Commissioner Jesus 'Chuy' Garcia. Though he led by about 11 points with nearly all precincts reporting, the victory came only after Emanuel failed to win a majority in a first-round February contest. That forced Chicago's first mayoral runoff.

Emanuel told voters he understands Chicago's challenges will require him to lead "in a different fashion."

The mayor must work with the Chicago Teachers Union and other unions to address a more than $20 billion pension crisis. He also must negotiate a new contract with the teachers union, which backed Garcia.

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