Sen. Blanche Lincoln of Arkansas speaks during a January 2009 aviation industry forum in Little Rock, Ark. Lincoln might be facing the toughest U.S. Senate race for a Democrat this year — which will be even tougher if her opposition receives generous donations from corporations per the recent Supreme Court ruling. Danny Johnston/AP hide caption

toggle caption Danny Johnston/AP

The Supreme Court decision on corporate spending in political campaigns overturns a 20-year-old ruling. Michael McCloskey hide caption

toggle caption Michael McCloskey

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