A.GoogleのCEOはジョン・マケインに同じ質問をしていたから。
http://www.quora.com/Barack-Obama/How-does-Obama-know-about-bubble-sort/answers/2113736
Because John McCain was asked the same question by then Google CEO Eric Schmidt earlier in the year (May 2007), when he was invited to Google.
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President Obama's aides noticed that and prepped him for it. President Obama could have gone prepared with a better answer but Dr. Eric Schmidt coulda followed up with a harder question, which is common in interviews for software development or engineering positions. So, he decided to use humor as a response.
Candidates@Google: John McCain
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ぐらいの、期待を込めてググってみたのにこんな理由が。
アメリカ大統領選の討論やら、インタビューの力の入れようを見ると当然問答集やリハーサルを重ねて
のぞんだんだろうなあ と感心する一方、ちょっと残念な結果に。