Thirty years ago, the mayor of Chicago was unseated by a snowstorm. A blizzard in January of 1979 dumped some 20 inches on the ground, causing, among other problems, a curtailment of transit service. The few available trains coming downtown from the northwest side filled up with middle-class white riders near the far end of the line, leaving no room for poorer people trying to board on inner-city platforms. African Americans and Hispanics blamed this on Mayor Michael Bilandic, and he lost the Democratic primary to Jane Byrne a few weeks later. Today, this could never happen.