UK peer Lord Ashcroft elaborates on taking the Giving Pledge -- and in the process, gives us a look inside a billionaire's reasoning.

"I have taken the pledge. No, I am not giving up alcohol – I enjoy the occasional glass of fine wine far too much to do that. Instead, I have signed up to The Giving Pledge, thereby making a public promise to donate more than half of my money to good causes." -- Michael Ashcroft, the Daily Telegraph

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