If you must know, ioi completely butchered the poll I sent him.
Original:
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Which will be the top selling game of 2008?
Grand Theft Auto IV
Gran Turismo 5
Mario Kart Wii
Super Smash Bros. Brawl
Wii Play
Other
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Brawl is an anticipated game, so that stole a lot of votes from Nintendo fans for Mario Kart. Wii Play would have neutralized that, but ioi decided to change it to Wii Fit which has no chance.
Gran Turismo 5 is a popular game among Sony fans, so they rallied behind it. Same with GTA, except ioi separated it by platform so that it had no chance of winning.