It gets better...according to Bloomberg, he really doesn't like to pay taxes--so much so that he owes the state of Ohio $1,200 in back taxes.
Also, they point out that, under Obama's plan, he would pay...wait for it...$900 more for his estimated $280,000 business. And this, evidently, is enough to push him over the edge so that he would be unable to purchase that business.
http://www.bloomberg.com/apps/news?pid=20601070&sid=aWDHvDjnDnTs&refer=home
also, according to the NYT, he isn't a licensed plumber
http://thecaucus.blogs.nytimes.com/2008/10/16/joe-in-the-spotlight/
and there is speculation about him being related to someone implicated in the Keating trails, though that seems even too pedestrian and stupid for the McCain campaign.
-s