Analysis of information sources in references of the Wikipedia article "2012 United States presidential election" in English language version.
The hundreds of thousands of television commercials broadcast by the presidential candidates are lopsidedly negative; this is the case with 80 percent of those put out by President Barack Obama and 84 percent of those for Mitt Romney.
Americans for Prosperity, the Virginia-based nonprofit that finances grass-roots activities across the country and ran an early and relentless television ad assault against President Obama during the 2012 campaign.
