Here is the congressman’s explanation , along with some caveats from Ryan Sager (although you might not trust him, either, since he has apparently become a cog in “the Rove machine“).

In Rep. Paul’s defense, I think this bit from Texas Monthly, quoted in the link, deserves highlighting: “What made the statements in the [congressman’s newsletter] even more puzzling was that, in four terms as a U. S. congressman and one presidential race, Paul had never uttered anything remotely like this.”