If you look at the breakdown of contributions to each of the leading presidential candidates, it is striking how top-heavy Hillary's campaign fundraising is compared to both Obama and McCain.

According to the Center for Responsive Politics, one-third of the contributions to Clinton (7,411 contributions) have come from donors who gave the maximum amount allowed by law - $4,600. This is compared to just 10 percent for Obama and 9 percent for McCain.

By contrast, McCain and Obama's percentage of contributions from donors who gave $200 or less is 22 percent and 26 percent, respectively. Hilary clocks in with only 12 percent of contributions coming from donors who gave less than $200.

And just as a point of reference, only 0.16 percent of adults in the U.S. give more than $200 in political donations in a given election cycle, so we are already talking about a relatively small group here.