Weather and politicians:
1979 blizzard was debacle.
https://www.chicagotribune.com/news/chi-the-blizzard-that-got-jane-byrne-elected-20141114-story.html
Remembering When A Snow Storm Brought Down A Political Empire
*On election day, Jane Byrne did the impossible: she beat Bilandic, defeating the Chicago Machine, and writing the final obituary for the Boss and his invincible army. The wild celebrations coming from Chicagoans who had longed for reform and an end to corruption, and especially the joy that poured from the typewriter of Chicago's brilliant anti-Daley newspaper columnist Mike Royko, were short-lived. Byrne won the general election in a landslide, but almost immediately made a pact with the same Daley stalwarts who had controlled the city for more than two decades. She served four tumultuous years as mayor and lost her re-election bid in another historic election, when in 1983, Chicago voters brought to power the city's first black mayor, Harold Washington.
https://www.gpb.org/blogs/two-way-street/2014/01/31/remembering-when-snow-storm-brought-down-political-empire