For some reason The American Spectator asked Samuel Joseph "Joe the Plumber" Wurzelbacher to contribute to its "books for Christmas" recommendations list. Joe recommends three (3) books on plumbing, including Flushed with Pride: The Story of Thomas Crapper, as well as this book:

The Theory of Money and Credit by Ludwig von Mises. The book is a 1912 study of monetary theory. It brought monetary theory into the mainstream of economic analysis. It is important reading for these troubled times.

I never believed that Joe was an "undecided voter." He was clearly an free market conservative who thought Social Security was a "joke."