Why isn't samus in a mario kart game?

[Captian_Twig]

sc94597 said:

Nintendo Zealot said:
Samus isn't in MK Wii because she is from the future and her kart would be way more advanced and powerful so she would always win. Same for Fox. Link on the other hand would have to ride a horse so he would lose every race.

 Hm I wonder how far in the future she is. It says in the first games manual that the galactic federation started in the year 2000. So maybe it is in this century. 

Jesus how'd we miss an intergalactic Federation being formed...