Who is going to hear it? The MSM will need “confirmation” that the voice is actually Obama. It will take them weeks and only then (after November 6th) will they determine that yes, it is Obama.
The only way the video is helpful is if Romney can use it in ads - otherwise no one will see it (Rommney’s 47% speech is being shown continuously in Obama commercials on all stations in Virginia).
The problem with Romney is that he would have to balance the value of using it vs. the media savaging for being “Racist” that would be 100 times worse than anything seen thus far.