"Much will depend on the wording, but today's decision is a small revolution in campaign finance law."

The Supreme Court has just issued the long-awaited Citizens United case. SCOTUSblog has a live-blog going on it. This is very big.

ADDED: Briefly:

The Supreme Court has ruled that corporations may spend freely to support or oppose candidates for president and Congress, easing decades-old limits on their participation in federal campaigns....

The justices also struck down part of the landmark McCain-Feingold campaign finance bill that barred union- and corporate-paid issue ads in the closing days of election campaigns.