Dear Mr. President - p!nk

This is a section of a concert at Wembley Arena, London in 2007. People may find it a bit too sentimental, but I think the song conveys the right message.
Besides, p!nk sings it really beautifully. With a lot of artists I found that the songs, when done live, are not a quarter as good as on a record. p!nk is an exception - fortunately!