Washington (CNN) Promising economic mobility and championing the middle class are key themes for candidates from both sides of the political aisle as the 2016 presidential campaign gets underway.

Most of the candidates don't have to worry about so much about their own finances.

During her first campaign trip to Iowa Democratic presidential candidate Hillary Clinton said "There's something wrong when CEO's make 300 times more than the typical worker," highlighting income inequality as one of her top priorities.

According to the Center for Responsive Politics, Clinton is worth an estimated $15,300,000. She could continue to make more money as the campaign progresses. Former President Bill Clinton told NBC he will continue to charge six-figure speaking fees while his wife runs because he has "to pay our bills."

The Clintons are wealthy, but they don't have the financial security of former Hewlett-Packard CEO Carly Fiorina, a Republican and the only other woman in the race. She is estimated to have more than four times as much as Clinton, with a net worth of $80 million.

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