This surprises no one. Generic Republican vs. Generic Democrat will always produce 45-48 percent for the Republican and 50-55 percent for the Democrat, in fact it works with any person.
Funny, then, that generic Republican led generic Democrat in 2002, then the two were about even in 2004, and generic Democrat led generic Republican in 2006. Lying to make your party look good generally isn't a good idea. If generic Democrat
currently leads generic Republican, it's because, surprise, surprise, the country actually prefers the Democrats right now.