As far as I know, Rackspace was not involved with the Obama fundraising website (other than this blog post which talks about Jekyll). Obama fundraising website was Jekyll/Akamai/AWS[EC2,S3,RDS] [1]. You can also watch a video from most of the Obama ops team about the stack on AWS [2].

[1] http://net.tutsplus.com/articles/interviews/chatting-with-ob...

[2] https://www.youtube.com/watch?v=X1tJAT7ioEg