Link: http://www.redszone.com/forums/showthread.php?t=85322
Some quick and dirty math to show what the Reds need to do the rest of the way to seal the division:
Reds : 77-55 after 132 games. 30 games remain.
Cards: 69-61 after 130 games. 32 games remain.
Reds lead by 7 games.
If Reds go 5-25(.167), and finish 82-80, Cards must go 14-18(.438).
If Reds go 8-22(.267), and finish 85-77, Cards must go 17-15(.531).
If Reds go 12-18(.400), and finish 89-73, Cards must go 21-11(.656).
If Reds go 15-15(.500), and finish 92-70, Cards must go 24-8(.750).
If Reds go 17-13(.567), and finish 94-68, Cards must go 26-6(.813).
If Reds go 20-10(.667), and finish 97-65, Cards must go 28-4(.875).
So obviously, if the Reds can play near .500 or better, that makes it a nearly insurmountable hill for the Cardinals to climb.