Pro-Obama Super PAC Outraises Romney Super PAC, Again

For the second consecutive month, the main pro-Obama super PAC has outraised its Romney-backing counterpart.

Priorities USA Action raised $15.2 million in September, according to a spokeswoman. The group has not yet officially reported its total to the Federal Election Commission, with Saturday being the deadline.

Restore Our Future, the main super PAC that has backed Romney since the GOP primary, raised $14.8 million in September, according to a disclosure already filed with the FEC.

Restore seems to have become the first super PAC to surpass $100 million in money raised. The other major Republican super PAC, the Karl-Rove-backed American Crossroads, has not yet reached that mark, raising $66.8 million since its inception in 2010. But along with the affiliated 501(c)4 Crossroads GPS, the two groups have surpassed that mark, as GPS raised $76 million in 2010 and 2011, according to tax returns released in April. The FEC lists 773 super PAC filers (including "Zombies of Tomorrow"), many of them small or defunct; it's unlikely any have surpassed Restore's total.

Last month, Priorities outraised Restore for the first time ever, taking in $10.1 million to Restore's $7 million. September was Priorities' largest fundraising month to date.

Other Democratic super PACs aren't doing so badly, either. Majority PAC, which focuses on Senate races, announced having raised $10.4 million in September, with another $9.7 million raised through Oct. 17. House Majority PAC, a group dedicated to House races, tells ABC News it took in $5.9 million in September and is on track to double that in October. September was the best fundraising month ever for both groups.