If you haven't already, go right now and read The New York Times article on who is funding the 2016 presidential race. Here's a tease:
The Chicago hedge fund billionaire Kenneth C. Griffin, for example, earns about $68.5 million a month after taxes, according to court filings made by his wife in their divorce. He has given a total of $300,000 to groups backing Republican presidential candidates. That is a huge sum on its face, yet is the equivalent of only $21.17 for a typical American household, according to Congressional Budget Office data on after-tax income.
I missed it the first time. That's "$68.5 million a month after taxes." So, yeah, for him, $300,000 is pretty much chump change and will always trump your $10 to Bernie Sanders.