With the pricetag on the 2012 presidential election at $2 billion — yes, you read that right, billion with a “b”— or higher, it’s tough to follow all of the various avenues by which money makes it into the candidate’s accounts.

Thankfully we have the “Consider the $ource” Tumblr, a joint project between the Center for Responsive Politics and the Center for Public Integrity — and one of the Fix’s best political Tumblrs.

Below, they’ve charted all of the various campaign committees affiliated with the presidential campaigns of Obama and former Massachusetts governor Mitt Romney.

And, even more helpfully, the chart detail show a single donor can cut a check for $75,800 and watch as it populates to the various aligned committees supporting the two presidential nominees.