Where you live can affect your chances of getting a liver transplant, and your risk of dying while waiting. The nation's transplant network says it's time to make the system fairer — and it may take a cue from how politicians redraw voting maps. "Gerrymandering for the public good" is how Johns Hopkins University transplant surgeon Dr. Dorry Segev describes a proposal to change the map that governs how donated livers are distributed around the country.