This report from Bloomberg Politics:
About 60 people have already donated at least $1 million to independent political committees supporting Democratic and Republican presidential hopefuls in what promises to be the most expensive election ever.
The number of major contributions, drawn from Wall Street to oil country to Silicon Valley, underscores the breadth of wealth that candidates can tap into for the 2016 election. So-called super-PACs and other outside groups raised more than $250 million during the first half of this year, according to filings Friday with the U.S. Federal Election Commission.
That amount far exceeds what was raised during the same period leading up to the 2012 race and is fast approaching the $374 million spent by super-PACs on the presidential campaign during the entire 2012 cycle, according to the Center for Responsive Politics.