The Chicago Fire lost at home to Union Omaha last night. Not sure if that's a higher or lower level of competition than what DC United faced last night.
They're in a different league (USL1) that is deemed to be at the same level of the soccer pyramid (such as it is) as the team DC United played (the NISA). I don't know which league is considered better, though my perception is that the USL1 is at least better-known.