From the Chicago Tribune's website on the 2007-2008 presidential campaign contributions, I punched in some search terms for the occupations of various donors, and this is what I found:

Click image to enlarge
But to keep today's health care costs in perspective, if we assume that the average family's annual insurance coverage costs $13,000 per year, Obama's total fund raising tab amongst the above groups would cover only a few more than 2300 families.
Wow.
Anyway, don't let all of this money go to waste - get out and vote on Tuesday.
-Wes