316 Million Americans.
215 Million eligible to vote (according to U.S. Census Bureau).
153 Million registered to vote. Some 62 million were declared unregistered or no longer registered by their states, according to the Census Bureau. This is for 2012 and does not account for recent voter suppression laws in Red States, which would make the ineligible numbers higher still.
Of those allowed to vote, only 36.4% bothered to in this last election (according to the AP).
Of those 36.4%, 52% were Republican, or about 28 million.
So you don't have to do the math (though I encourage you to check yourself):
This means that just 9% of the entire U.S. population constitutes what John Boehner claims is a mandate from the American People.
9%.
For the 137 million of you who couldn't be bothered, or were too cynical to vote because "all politicians are the same," I have nothing but contempt.