New financial reports out this weekend are expected to show the two top Republican presidential candidates are neck-and-neck in efforts to fill their campaign war chests.

Former Massachusetts Gov. Mitt Romney and Texas Gov. Rick Perry both have roughly $15 million in cash on hand, and both candidates raised a combined $30 million this summer.

The campaigns, however, lag behind the $70 million raised by President Barack Obama and the Democratic Party.

The reports will offer a broad look at the Republican field's finances. They're the first official tallies for contenders Perry, businessman Herman Cain and Minnesota Rep. Michele Bachmann.

But the filings won't capture the tens of millions raised by new, outside groups known as super political action committees, which can raise unlimited amounts of money to influence elections.