If he starts now it will take at least seven years of schooling, testing and professional experience for Joe to obtain his Masters license, so his concern about Obama's tax plan seems to be the least of his worries in his dream to make $250,000/yr.
Most plumbers today are scrambling for work. With housing starts down, many plumbers are laid off or are cooling their heels on the union 'bench'. Even remodeling which usually picks up when housing starts fall is down because of the credit crisis.
Joe says he works in a two man shop. It is not legal for Joe to work unless he is directly and constantly supervised by his boss. If they charge $100 an hour for their labor the most money they could gross would be $208,000 a year. If they charge $100 an hour for both plumbers they need to be turned in to the Better Business Bureau, because, again, Joe is qualified to do nothing more than manual labor. That $208,000 is their max gross profit working 52 weeks a year/40 hours a week. From that, they need to pay for their plumbing van, their tools, their gas (the price of which more than doubled in the last eight years, Joe. Real plumbing companies are more concerned about that), their healthcare and so on.
If Joe's boss is talking about selling the business for $250,000 trust me it will be a looooong time before they net that profit in a year.
If McCain is going to send shills around to Obama's appearances, he should at least send genuine Americans who have genuine concerns. McCain's problem is that he has never met a genuine American.
P.S. If McCain sold Cindy's $300,000 convention night get up he could buy Joe's business for him. If Ohio officials look into Joe's illegal plumbing activities and shut him down it is the least Daddy Beerbucks could do for his "old buddy Joe".