Chicago’s public pensions will pose a challenge for Brandon Johnson after he’s sworn in as mayor next week. A pension expert considers them the worst-funded of any major U.S. city. WBBM's Nancy Harty has the details.

<p>Chicago’s public pensions will pose a challenge for Brandon Johnson after he’s sworn in as mayor next week. A pension expert considers them the worst-funded of any major U.S. city. WBBM's Nancy Harty has the details.</p>

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