The Supreme Court loosened restrictions on ads, a decision which could reshape some dynamics in the 2008 election.

The court, split 5-4, upheld an appeals court ruling that an anti-abortion group should have been allowed to air ads during the final two months before the 2004 elections. The law unreasonably limits speech and violates the group’s First Amendment rights, the court said.

The decision could lead to a bigger role for corporations, unions and other interest groups in the 2008 presidential and congressional elections.

The case involved advertisements that Wisconsin Right to Life was prevented from broadcasting. The ads asked voters to contact the state’s two senators, Democrats Russ Feingold and Herb Kohl, and urge them not to filibuster President Bush’s judicial nominees.