Why do Chicago VC's lag so far behind others?

Chicago being the 3rd largest city in the country and filled with plenty of wealthy angel investors and VC's, seems to really miss the mark in the internet field. We see much smaller markets from Boston, Austin, Boulder, San Francisco to merge as a growing hub for web entrepreneurs. Why does Chicago seem ages behind the rest of the country? There are very few if no angel funds, start up groups, or incubators. Chicago, whats up?