The Wisconsin Democracy Campaign has some interesting numbers:
Seventy individuals and couples gave $874,161 or 13 percent of the total large individual contributions in 2009 and they invested much of it in the governor and statewide candidates in the upcoming 2010 general election, a Wisconsin Democracy Campaign analysis shows.
I recommend the rest of the post. It gives an interesting look into how casually business interests give money to politicians. It also sends ominous reminders of how important contribution limits are to preserving our system of democracy, in which leaders heavily favor the wealthy but cannot win on the support of the wealthy alone.
