(MSNBC) — Thirty-four U.S. billionaires pledged Wednesday to give away at least 50 percent of their wealth to charity as part of a campaign by investor Warren Buffett and Microsoft founder Bill Gates. Among the billionaires joining the campaign are New York Mayor Michael Bloomberg, entertainment executive Barry Diller, Oracle co-founder Larry Ellison, energy tycoon T. Boone Pickens, media mogul Ted Turner, David Rockefeller and investor Ronald Perelman.

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