It is a different ball game this time around.

At the moment, President Obama's campaign has $170 million in the bank while his GOP opponent, Mitt Romney, has $144 million.

But the Romney money machine is gaining momentum. 

It raised more money than the Obama campaign in May and June. Romney's donors also appear to have more money: Only 17 percent of Romney's donations have been less than $200, compared to 40 percent of Obama's donations that came in at less than $200.

The big money going to Romney also has more ways than ever to avoid limits on donations. Keep in mind this is the first presidential election since the Supreme Court's ruling in Citizens United, which opened the floodgates for unlimited contributions to outside groups and created the super-PACs.

Since January 2011, the GOP super-PACs have collected $228 million while Democratic super-PACs have deposited only $80 million.