WASHINGTON — Overruling two important precedents about the First Amendment rights of corporations, a bitterly divided Supreme Court on Thursday ruled that the government may not ban political spending by corporations in candidate elections.

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Justices Anthony M. Kennedy and John Paul Stevens, right.
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Dave Bossie, President of Citizens United, spoke to the press following Thursday’s Supreme Court decision.

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The 5-to-4 decision was a vindication, the majority said, of the First Amendment’s most basic free speech principle — that the government has no business regulating political speech. The dissenters said that allowing corporate money to flood the political marketplace would corrupt democracy.

The ruling represented a sharp doctrinal shift, and it will have major political and practical consequences. Specialists in campaign finance law said they expected the decision to reshape the way elections were conducted. Though the decision does not directly address them, its logic also applies to the labor unions that are often at political odds with big business.

The decision will be felt most immediately in the coming midterm elections, given that it comes just two days after Democrats lost a filibuster-proof majority in the Senate and as popular discontent over government bailouts and corporate bonuses continues to boil.

President Obama called it “a major victory for big oil, Wall Street banks, health insurance companies and the other powerful interests that marshal their power every day in Washington to drown out the voices of everyday Americans.”

The justices in the majority brushed aside warnings about what might follow from their ruling in favor of a formal but fervent embrace of a broad interpretation of free speech rights.

“If the First Amendment has any force,” Justice Anthony M. Kennedy wrote for the majority, which included the four members of the court’s conservative wing, “it prohibits Congress from fining or jailing citizens, or associations of citizens, for simply engaging in political speech.”

The ruling, Citizens United v. Federal Election Commission, No. 08-205, overruled two precedents: Austin v. Michigan Chamber of Commerce, a 1990 decision that upheld restrictions on corporate spending to support or oppose political candidates, and McConnell v. Federal Election Commission, a 2003 decision that upheld the part of the Bipartisan Campaign Reform Act of 2002 that restricted campaign spending by corporations and unions.

The 2002 law, usually called McCain-Feingold, banned the broadcast, cable or satellite transmission of “electioneering communications” paid for by corporations or labor unions from their general funds in the 30 days before a presidential primary and in the 60 days before the general elections.

The law, as narrowed by a 2007 Supreme Court decision, applied to communications “susceptible to no reasonable interpretation other than as an appeal to vote for or against a specific candidate.”

The five opinions in Thursday’s decision ran to more than 180 pages, with Justice John Paul Stevens contributing a passionate 90-page dissent. In sometimes halting fashion, he summarized it for some 20 minutes from the bench on Thursday morning.

Joined by the other three members of the court’s liberal wing, Justice Stevens said the majority had committed a grave error in treating corporate speech the same as that of human beings.

Eight of the justices did agree that Congress can require corporations to disclose their spending and to run disclaimers with their advertisements, at least in the absence of proof of threats or reprisals. “Disclosure permits citizens and shareholders to react to the speech of corporate entities in a proper way,” Justice Kennedy wrote. Justice Clarence Thomas dissented on this point.

The majority opinion did not disturb bans on direct contributions to candidates, but the two sides disagreed about whether independent expenditures came close to amounting to the same thing.

“The difference between selling a vote and selling access is a matter of degree, not kind,” Justice Stevens wrote. “And selling access is not qualitatively different from giving special preference to those who spent money on one’s behalf.”

Justice Kennedy responded that “by definition, an independent expenditure is political speech presented to the electorate that is not coordinated with a candidate.”

The case had unlikely origins. It involved a documentary called “Hillary: The Movie,” a 90-minute stew of caustic political commentary and advocacy journalism. It was produced by Citizens United, a conservative nonprofit corporation, and was released during the Democratic presidential primaries in 2008.

Citizens United lost a suit that year against the Federal Election Commission, and scuttled plans to show the film on a cable video-on-demand service and to broadcast television advertisements for it. But the film was shown in theaters in six cities, and it remains available on DVD and the Internet.

The majority cited a score of decisions recognizing the First Amendment rights of corporations, and Justice Stevens acknowledged that “we have long since held that corporations are covered by the First Amendment.”