U.S. elections 2012 - Obama campaign spending 2011, by category | Statista
Barack Obama: Campaigns and Elections | Miller Center
Obama, campaigning in Georgia, warns of threats to democracy | AP News
President Barack Obama's First Two Years: Policy Accomplishments, Political Difficulties
How the Presidential Candidates Use the Web and Social Media | Pew Research Center
The 2012 Election: Our Price Tag (Finally) for the Whole Ball of Wax • OpenSecrets
Obama, Biden to campaign for Fetterman, Shapiro in Pennsylvania
Illuminating 2020 Report: The 2020 General Election Campaign Advertising on Facebook – Illuminating
How Much It Costs to Run for President? A 40-Year Timeline
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Obama Campaign Cost: 2012 Presidential Election
Obama Raised $52 Million In June, Outpacing McCain - WSJ
US elections: How Obama became a campaign fundraising phenomenon | Barack Obama | The Guardian
Barack Obama - Ballotpedia
How much money is behind each campaign? - Washington Post
INFOGRAPHIC: Obama, Romney Final Ad Spend
Obama outspends Romney on online ads - CNNPolitics
Obama outspends Romney on online ads - CNNPolitics
How the Presidential Candidates Use the Web and Social Media | Pew Research Center
U.S. elections 2012 - Obama campaign spending March 2012 | Statista
The Internet's Role in Campaign 2008 | Pew Research Center
Obama Takes in a Record $150 Million, But McCain Narrows Gap in Some Polls - WSJ
Breakdown: How Campaigns Spend Their Millions - ABC News
Nearing Record, Obama's Ad Effort Swamps McCain - The New York Times
How the Trump Campaign Is Drawing Obama Out of Retirement - The New York Times
