I was there
It was about 300 idiots tying up downtown Chicago and infuriating even local democrats
Took me three hours to get from midway airport and then around downtown to the Waldorf
Michigan ave and State and LaSalle all blocked
Crazy
Rahm Emmanuel made it happen
More likely the traffic tie-up was due to the fire at the Old Post Office above the Eisenhower.
http://abc7chicago.com/news/fire-at-chicagos-old-main-post-office-jams-downtown-traffic/1619980/