Shapes campaign spending
The decision reshaped how money flows through U.S. elections by allowing unlimited independent spending by outside groups, increasing the role of super PACs and nonprofit organizations.
In plain English
When outside groups can spend unlimited money.
A Supreme Court case that said outside groups like corporations, unions, and nonprofits can spend unlimited money on political ads, as long as they don't give it directly to a candidate's campaign.
Simple example
After the 2010 ruling, outside spending in federal elections rose from about $338 million in 2008 to more than $2.7 billion in 2020, according to OpenSecrets.
Why it matters
What the term actually changes.
Free speech debate
Supporters say it protects political speech under the First Amendment regardless of the speaker's identity. Critics say it amplifies the voices of wealthy donors and corporations over individual voters.
How it works
The mechanics, in practice.
Independent expenditures
Corporations, unions, and nonprofits may spend unlimited sums on ads and other political communications, provided the spending is not coordinated with a candidate's campaign.
Direct donation caps remain
The ruling did not change federal limits on contributions made directly to candidates, party committees, or traditional PACs.
Paths to reversal
Overturning the decision would require a constitutional amendment, a future Supreme Court reversing the precedent, or narrower legislation such as new disclosure requirements.
Related guide
What is Citizens United, and what would overturning it mean?
A 2010 Supreme Court ruling reshaped how money flows into American elections — and the debate over whether to undo it is still unresolved.
Read the guide → Related issue brief
Should Citizens United be overturned?
More than a decade after the Supreme Court reshaped campaign finance, Americans remain divided over whether the ruling should stand.
Read the brief →You’ve learned the term. Now vote.
Should Citizens United be overturned?
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