In legal terms, the dispute turns largely on this: Whether the Republican maneuver in 2003 crossed the line between "excessive partisanship -- which is unconstitutional -- and permissible partisanship -- which is not unconstitutional," according to Guy-Uriel E. Charles, a law professor who summarized the case in an American Bar Association publication. ...

Critics of the Republican reapportionment plan also allege the new district lines violate the Voting Rights Act, which is designed to protect the rights of blacks and Hispanics. In addition, they argue that the Constitution prohibits mid-decade redistricting, and that Republicans ignored updated census data, violating the Constitution's requirement on one person, one vote.

The Court hasn't been anxious to interfere with the political process of redistricting, provided map drawers adhere to the "one person, one vote" rule and avoid obvious attempts to dilute minority voting power. Challengers to the Texas redistricting plan may be hoping that the stench DeLay carries with him infuses the redistricting scheme, motivating the Justices to clean up the problem instead of holding their noses.

Keep an eye on Justice Kennedy.

Kennedy cast the swing vote in a 5-4 decision in 2004 that upheld Republican redistricting in Pennsylvania. But unlike other justices who made up a majority, he suggested some future claim against gerrymandering might have merit. "The assumption is that Justice Kennedy sees something in this case t