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After 22 years, the outgoing mayor got a warm reception and admitted he was a bit emotional.
The festivities began at 9 a.m. with a mass at Old St. Patrick's Church.
Then, as they have for decades, crews poured dye into the Chicago River to turn it bright green.
The parade was Richard Daley's final time leading the parade as mayor of the city of Chicago.
St. Patrick High School was the guest of honor. The city's oldest all-male Catholic high school is celebrating its 150th year.