by Vitter and former Bush administration official Karl Rove, Kennedy announced plans to challenge Landrieu in 2008. In the end, Landrieu was re-elected with 52% of the vote, Kennedy having 46%. Maine In Maine, Susan Collins sought a third term in the Senate. She has maintained a high approval rating, and also in her favor is the landslide re-election of Maine's senior Senator, Olympia Snowe, who had the largest margin of victory of any GOP Senate candidate - besides the largely unopposed Richard Lugar (R-IN) - in the 2006 election cycle. Collins was re-elected with 58% of the vote in 2002 over State Sen. Chellie Pingree. Fellow senator Joe Lieberman, citing his status as an independent, endorsed Collins in her 2008 re-election bid. On May 8, 2007, Rep. Tom Allen (ME-1) announced his candidacy on his website. He had already expressed interest in running and had been building the apparatus necessary to wage a Senate campaign. Collins won on election day with 61% of the vote, compared to 39% for Allen. Massachusetts Incumbent John Kerry sought another Senate term in Massachusetts. Republican author and conservative activist Jerome Corsi, known for his public criticism of Kerry, had stated that he would run for the seat in 2008 but later changed his mind. Jim Ogonowski, a retired Air Force pilot who was closely defeated by now-Representative Niki Tsongas in a 2007 special election, was running against Kerry. but failed to obtain the required candidacy signatures. The Republican challenger turned out to be Jeff Beatty, an ex-Army Delta Force officer who garnered 30% of the vote in a challenge to Democratic Congressman Bill Delahunt in 2006. Kerry was challenged by defense attorney Edward O'Reilly for the Democratic nomination, winning 69% of the vote to O'Reilly's 31%. Kerry won with 66% of the vote to Beatty's 31%. Libertarian Robert J. Underwood had 3%. Michigan With the Democratic Party takeover of Capitol Hill in the 2006 midterm elections, senator Carl Levin had become one of the most powerful people in Washington as chairman of the Senate Armed Services Committee. He was expected to easily win re-election. Challenging Levin were Republican State Representative Jack Hoogendyk, Green candidate Harley G. Mikkelson, US Taxpayers' candidate Mike Nikitin, Libertarian professor Scotty Boman, and Natural Law's candidate Doug Dern. Levin won re-election with 63% of the vote, to Hoogendyk's 34%. Minnesota 2007 year-end reports filed with the Federal Election Commission