Florida is a state with nearly a half million more registered Democrats than Republicans. You wouldn't know it, though, from the state's seats in Congress — 17 of the 27 congressional seats are held by Republicans.
A lot of factors play into that: the concentration of Democrats in urban areas, the talent Florida's Republican Party has for turning out its voters. But another factor is how the congressional district maps are drawn.
In a momentous ruling Thursday, Florida's Supreme Court has scrambled those maps just over a year before the next election.