Because Red and Blue had a better RIVALRY. Did gamefaqs request the aide of the mentality handicapped for running this contest? Maybe to better relate to the voters. Since apparently, Mario and Bowser are not only rivals, but the best the video game industry has seen.... oh wait.
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http://i202.photobucket.com/albums/aa72/Majorwontons/chuckle.jpg
Philosophy teaches questioning without answers. Religion teaches answers without questioning.