Barack Obama’s campaign spent $3.5 million on web advertising between January and April. Of that $2.8 million was spent on Google according to Federal Election Commission filings by Obama for America.

It is estimated that as much as $3 billion could be spent by political campaigns on all forms of advertising. The Obama campaign deployed a mix of pay for performance and display ads on Yahoo, Specific Media, Pulse360, Microsoft’s DrivePM, AOL’s Quigo and CNN. Spending for other candidates were not available.

Below is a break down of publicly available spending related to online advertising and media strategy for Barack Obama and Hillary Clinton. See also: Barack Spends $1 Million On Google.

Spending Category             Barack Obama       Hillary ClintonGoogle                          $2,941,500               $67,000Yahoo                             $350,500                $9,186Yahoo Right Media                  $23,560                    $0Yahoo Pulse                        $36,500                    $0Microsoft                          $67,500                    $0Facebook                           $26,000                    $0AOL                                $25,000                    $0Broadband Enterprises              $80,000                    $0CNN.com                            $24,000                    $0Politico                           $36,000                    $0Gothamist                           $2,800                    $0Web Consultants                    $93,162                    $0Ad Consultant - Howard Wolfson         n/a              $997,000Media Strategist - Mandy Grunwald      n/a            $2,540,000Pollster - Mark Penn                   n/a            $3,800,000Direct Mail - Mark Penn                n/a           $10,000,000