Barack Obama, Mitt Romney Fundraising Outpaces Field [INTERACTIVE GRAPHIC]

Presidential candidates have combined to raise more than $275 million this cycle, preparing for a campaign likely to be the costliest ever.

The candidates filed reports detailing their fourth-quarter fundraising on Tuesday. President Obama remains well ahead of all the Republican candidates, and Mitt Romney, as the GOP front-runner, leads his primary opponents.

Use this interactive graphic to see how much each candidate has raised over time. Select different states to see each candidate's fundraising on a regional level.