A Progress Illinois analysis of the 2008 general election results found that every county in the state voted heavily against the proposed 2010 constitutional convention. This isn't a huge surprise, considering that the referendum was defeated by over a 30 percent margin at the statewide level. Nonetheless, the lack of variance is pretty striking.
As we were collecting the data, I wondered if we'd end up finding one idiosyncratic little county that bucked the trend. But no dice. In fact, only a single county -- Alexander, located at the southern tip of the state -- saw more than 40 percent vote in favor of Con-Con (42.6 percent to be exact).