WASHINGTON (Reuters) - Top Republican donors Sheldon Adelson and his wife gave another $10 million to the "Super PAC" backing Republican presidential candidate Mitt Romney in October, saying they hoped to "level the playing field" with Democrats ahead of the November 6 election. In a campaign year of unprecedented contributions, Adelson and his wife Miriam have stood out above the rest. The 79-year-old billionaire chairman of Las Vegas Sands Corp, Adelson emerged as the Republican Party's biggest patron in the 2012 campaign, pouring at least $47 million into Republican coffers with his wife. ...

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