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Hello on this Thursday, January 3, 2008. I'm Kristin Volk with a UPI Headline Update. Senator Barack Obama has grabbed the number one Democratic spot in Iowa as voting for the 2008 presidential election begins there today. That's according to a new poll just released. Barack Obama is in a four-point lead over John Edwards. Hillary Clinton has faded to third. In the Republican race, Mike Huckabee expanded his lead six points over former Massachusetts governor Mitt Romney. Former Tennessee Senator Fred Thompson is in third place. Today's contest in Iowa kicks off a state-by-state battle to choose Republican and Democratic candidates for the November election to replace President Bush. Meanwhile, New York mayor Michael Bloomberg is denying that he'll run for president. There's been speculation recently that the mayor may jump into the race after it was announced that he would attend a forum next week. That forum is being led by a bipartisan group that believes the Republican and Democratic parties are out of touch. Bloomberg is now independent. Earlier today, he said he's going to focus on being mayor and wants to see an independent approach in the '08 elections to stop partisan bickering and special interests. The U.S. Justice Department is launching an investigation into the CIA's destruction of those videotapes. The tapes showed harsh interrogation techniques of terrorism suspects. The CIA says it acted lawfully, but critics say the agency ignored court orders and investigators' requests that it hand over evidence in various terrorism cases. A California congressman is retiring after being diagnosed with cancer. Democrat Tom Lantos says he will not seek re-election this year because of his disease's treatment and development. The 79-year-old, who's the chairman of the House Foreign Affairs Committee, says he has esophageal cancer. Lantos is the latest of more than a dozen members to announce plans to leave the House at the end of the year. That's all for now. Check out our new special segment called Nothing but Hope on upi.com today. Thanks for watching.