The Washington Post says:

The top super PAC devoted to Mitt Romney’s presidential campaign spent three times as much as it raised in August, as the GOP nominee’s campaign faced a cash shortfall.

A new filing from the super PAC, Restore Our Future, shows it spent $21.2 million in August — far more than the $7 million it raised — and had just $6.3 million left at the end of the month.

Something that people don't figure into the super PAC equation is that there are only so many available hours of commercial time to buy, and you can only buy so many ads before you reach saturation point. Eventually, people will start to tune you out. This kind of frantic spending indicates, to me, that Restore Our Future maybe reached that ceiling. You can have all the money in the world, but if you're not spending smart, you might as well burn every last dollar.