Because the GOP wants it to be:
In America in 2012, poor people and elderly people and students should not have to wait seven hours to vote. They should not be restricted in this fashion by elected officials who justify the hardships they impart upon black voters by calling those voters "lazy." By allowing this ugliness to endure, year after year, election after election, we don't just subvert our own democracy. We preclude ourselves from turning to the world and proclaiming that we respect the value of a single vote and the dignity of a single voter. We don't practice what we preach.