Minnesota Congressman Keith Ellison has filed a brief with the Supreme Court in a voter ID case. The Minnesota Democrat is asking the court to strike down an Indiana law that requires people to have a photo ID to vote, arguing it disenfranchises black voters.

This is Ellison's latest effort to make his mark on voting rights issues.

Last month, the freshman congressman introduced legislation that would ban the ID requirement in federal elections.

Ellison filed the brief with the support of all of the members of the Congressional Black Caucus, including presidential candidate Barack Obama, a Democratic senator from Illinois.

In the brief, Ellison argues that the tax violates the 24th Amendment's ban on poll or other taxes to vote.