JUDY WOODRUFF:

But first: The U.S. Supreme Court began its new term this week with a full bench of nine justices and a jam-packed docket.

Today's case, on partisan gerrymandering, has the potential to reshape American politics as we know it.

Our regular Supreme Court watcher, Marcia Coyle, will join Lisa Desjardins to break down the arguments.

The case centers on a redistricting map in Wisconsin.

And that's where special correspondent Jeff Greenfield begins.