(Editor's Note: Biden dropped out of the presidential race for the Democratic nomination, following a poor showing in the Iowa caucuses on Jan. 3, 2008, where he got only about 2 percent of the delegates.)
Biden is a longtime opponent of building a federal nuclear repository facility at Yucca Mountain, which is about 90 miles northwest of Las Vegas. In 2002, after voting in the Senate against using Yucca as a depository site, he issued a statement explaining his vote, saying he didn't think it was safe to ship 77,000 tons of high-level nuclear waste through at least 43 states, including his home state of Delaware. Biden has said the safety concerns include numerous fault line problems at Yucca. He also has said the waste should be stored at the plants that produce it.
Biden's Senate Web site: Read Biden's statement after he voted against a Senate bill in 2002.
— Las Vegas Sun new media managing editor Dave Toplikar compiled this report.