Along with the Democratic National Committee, Obama raised $75 million but spent $91 million in July. Meanwhile, GOP nominee Mitt Romney racks up more cash. Check out this chart from The Fix:

And Romney has been able to save more of his money, because he has more help. At the end of last month, 80 percent of GOP presidential ad spending came from super PACs and other outside groups, while only 19 percent of Democratic spending did. But Obama's campaign argues that investments in staff and online infrastructure will pay off in the long run.