Chicago Mayor calls tax criticism 'insult'

The Chicago Sun-Times reports:

Lambasted for saddling beleaguered Chicago taxpayers with an unprecedented $293 million burden, Mayor Daley fired back today: He called it an "insult" for anyone to suggest it means he doesn't care that working people are struggling.

The mayor was referring to media criticism in general and newspaper editorials in particular.

Can you name what political party Mayor Daley's from?