The presidential field has dwindled significantly, but not before the candidates raised more than half a billion dollars in 2007. By some predictions, the eventual nominees will need to raise $500 million apiece to compete—a record sum. To find out where all this money is coming from, click on the candidates’ names below and explore the options to the left. The candidates now file campaign finance reports monthly.

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Obama, Barack

Total Spent $323,585,292
Cash on Hand $65,837,809

McCain, John

Total Spent $141,397,734
Cash on Hand $32,768,214