Original sentence: The closeness of the race between the leading contenders, Hillary Rodham Clinton and Barack Hussein Obama, has increased the chance that the superdelegates will play a decisive role in selecting the nominee, a prospect that has caused unease among some Democratic Party leaders
Edited sentence: The closeness of the race between the leading contenders, Hillary Rodham Clinton and Barack Obama, has increased the chance that the superdelegates will play a decisive role in selecting the nominee, a prospect that has caused unease among some Democratic Party leaders