The early voting allowed the democrats to gain advantage as Romney caught a very large boost from the 1st debate, which was the 1st time many became acquainted with him. So millions of early voters were manipulated in Oliars favor.
This democrats know. That's why they pushed for it.
When they are not the incumbent, the MSM will push their democommie pick on the TV a million times before the late debate, and of course then no advantage will occur with early voting.