Actually, back in Reagan's day the comparisons with Alfred E. Neuman usually were made to Oliver North.
My favorite, back when SPY magazine originated the 'Separated At Birth' concept, was a great pair of pictures comparing Don Knotts and Mick Jagger. I wish I could show it to you.
On the other hand, if you want to compare Dubya to someone, take a look at these:
http://www.bushorchimp.com/