I totally read that domain name as "McNotart" at first. Or maybe "McNaughtyart"
Also, on his site, he explains that in his painting "One Nation Under God", each person represents a symbol of something that "influenced the Constitution in a positive way." Which basically means he thinks Palpatine did some good.
EDIT: Apparently the hooded Palpatine figure is supposed to be Satan, and a lot of people have pointed him out.
EDIT 2: So apparently standing beside Satan is the liberal "Professor" who carries a copy of The Origin of Species in his hand. Subtle, man. Real subtle.