State of Kansas, Plaintiff v. State of Colorado
Decided March 9, 2009. Samuel A. Alito Jr. delivered the opinion of the Court.
Docket 105 ORIG · 556 U.S. 98 (2009)
We don’t yet publish a summary of this opinion. Read the official text below for the Court’s holding and reasoning.
How the Justices voted
Decided 9–0.
Majority · 7
- Samuel A. Alito Jr. · delivered the opinion of the Court
- Anthony McLeod Kennedy
- Antonin Scalia
- Clarence Thomas
- John Paul Stevens
- Ruth Bader Ginsburg
- Stephen Gerald Breyer
Concurring · 2
- David Hackett Souter
- John Glover Roberts Jr. · filed a concurring opinion
“Concurring” means agreeing with the outcome; any split shown is the Court’s judgment, not each Justice’s reasoning. Source: the Supreme Court Database (Spaeth et al.), Washington University.
Official text
Read the official opinion (U.S. Reports, govinfo.gov)
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Samuel A. Alito Jr.’s profile · All Supreme Court opinions · The Supreme Court
Source: the U.S. Reports via govinfo.gov; authoring Justice and vote lineup from the Supreme Court Database (Washington University). Data last verified 2026-08-15. Informational only; verify against the primary source before relying. Not a consumer report (FCRA).