After the 2008 election, the right-leaning Washington Examiner learned through a records search that 88% of the campaign donations made by network news employees, including writers, producers, reporters, and executives, went to Democrats. Not coincidentally, a Harvard study conducted during the 2008 election found that 47% of the print and broadcast stories about Barack Obama were overtly positive vs. only 12% positive for John McCain, while the Washington Post’s own ombudsman acknowledged that Obama received three times more front-page coverage than McCain, and that reporters went over the top in their scrutiny of Gov. Palin compared to then-Sen. Biden.
A Media Research Study further confirmed the bias, studying every mention of Barack Obama since his appearance on the national stage in 2004, concluding:
The networks downplayed or ignored major Obama gaffes and scandals. Obama’s relationship with convicted influence peddler Tony Rezko was the subject of only two full reports (one each on ABC and NBC) and mentioned in just 15 other stories. […] The networks minimized Obama’s liberal ideology, only referring to him as a “liberal” 14 times in four years. In contrast, reporters found twice as many occasions (29) to refer to Obama as either a “rock star,” “rising star” or “superstar” during the same period.
In covering the campaign, network reporters highlighted voters who offered favorable opinions about Obama. Of 147 average citizens who expressed an on-camera opinion about Obama, 114 (78%) were pro-Obama, compared to just 28 (19%) that had a negative view, with the remaining five offering a mixed opinion. Source.