Breakdown: How Campaigns Spend Their Millions - ABC News
How much money is behind each campaign? - Washington Post
INFOGRAPHIC: Obama, Romney Final Ad Spend
R.I.P. positive ads in 2012 election - POLITICO
Obama's Spending: 'Inferno' or Not? - FactCheck.org
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Obama Campaign Cost: 2012 Presidential Election
How Much It Costs to Run for President? A 40-Year Timeline
The 2012 Election: Our Price Tag (Finally) for the Whole Ball of Wax • OpenSecrets
The Science Behind Those Obama Campaign E-Mails - Bloomberg
Barack Obama 2008 presidential campaign - Wikipedia
How the Trump Campaign Is Drawing Obama Out of Retirement - The New York Times
Obama Takes in a Record $150 Million, But McCain Narrows Gap in Some Polls - WSJ
Illuminating 2020 Report: The 2020 General Election Campaign Advertising on Facebook – Illuminating
How the Presidential Candidates Use the Web and Social Media | Pew Research Center
Getting and spending: US election money wars – Channel 4 News
Nearing Record, Obama's Ad Effort Swamps McCain - The New York Times
Obama campaigns for Warnock, Abrams in push for Georgia to vote for Democrats : NPR
Breakdown: How Campaigns Spend Their Millions - ABC News
U.S. elections 2012 - Obama campaign spending 2011, by category | Statista
Obama, campaigning in Georgia, warns of threats to democracy | AP News
Obama Raised $52 Million In June, Outpacing McCain - WSJ
How the Presidential Candidates Use the Web and Social Media | Pew Research Center
How Money Affects Elections | FiveThirtyEight
The Internet's Role in Campaign 2008 | Pew Research Center
