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Hillary Clinton and Bernie Sanders compete for New York primary voters in CNN's Democratic Presidential Primary Debate at the Brooklyn Navy Yard Thursday, April 14, 2016.

(Seth Wenig, Associated Press)

Here is today's number in the world of politics:

Today's number is 10.5 million.

The Democratic presidential candidates are spending a combined $10.5 million on advertising in New York, reports Politico.

Bernie Sanders is set to spend almost $7 million, nearly doubling Hillary Clinton's $3.7 million.

Sanders' significant spending comes as the Vermont senator attempts to close a 10 percentage point deficit, according to recent polls.

Democrats account for nine out of every 10 dollars spent on New York's airwaves. Read more at Politico.