RENO, Nevada (Reuters) - White House hopeful Barack Obama talked energy policy on Sunday with T. Boone Pickens, a billionaire oil investor who funded the "Swift Boat" attacks on Democratic presidential nominee John Kerry in 2004. Pickens, a lifelong Republican, has endorsed neither his party's candidate, Arizona Sen. John McCain, nor Democrat Obama in the November 4 election and wants to make energy a top campaign issue. He has advocated a plan to cut U.S. oil use by converting cars to run on natural gas. Pickens funded efforts in 2004 by a group called Swift Boat Veterans for Truth, which...