[Vision2020] Where did Barack Obama launch his political career?

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This CNN video (4:35) shows that State Senator Alice Palmer announced
Barack Obama as her heir apparent at the home of domestic terrorist
Bill Ayers:

http://www.youtube.com/watch?v=dvROBLortBQ

Last night, however, Barack Obama absolutely denied that he launched
his political career at Ayers house (3:35):

http://www.youtube.com/watch?v=abLh3b68IHc

I am confused. Should I believe Alice Palmer or Barack Obama?