The justices say a state law cannot supersede its 2010 Citizens United ruling, which let corporations deploy their money to help or attack specific candidates. Montana had argued that a history of corporate-financed corruption in state government should let tough state laws remain in force.
The investigation continues into the vast political donor network of D.C. businessman Jeffrey Thompson, and new documents released show a connection between Thompson and former Mayor Marion Barry's one-time drug dealer.
Donors, fundraisers and Republican luminaries gathered in Park City, Utah, over the weekend for the Romney Victory Leadership Retreat. Those who attended received briefings from Romney campaign officials and had opportunities to interact with Romney.
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