Corporations, labor unions and other political entities are gearing up to play a larger role in influencing elections in 2010 and beyond after a decision by the U.S. Supreme Court to strike down elements of campaign-finance law.

The Supreme Court on Thursday made it easier for entities to influence elections for Congress and the White House by stripping away rules that limited their ability to fund campaign advertisements.

The court also struck down a part of the 2002 McCain-Feingold campaign-finance law that prevented independent political groups from running advertisements within 30 days of a primary election or 60 days of a general election.

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