from
Media Matters:
Among the study's key findings:
The balance between Democrats/progressives and Republicans/conservatives was roughly equal during Clinton's second term, with a slight edge toward Republicans/conservatives: 52 percent of the ideologically identifiable guests were from the right, and 48 percent were from the left. But in Bush's first term, Republicans/ conservatives held a dramatic advantage, outnumbering Democrats/progressives by 58 percent to 42 percent. In 2005, the figures were an identical 58 percent to 42 percent.
Counting only elected officials and administration representatives, Democrats had a small advantage during Clinton's second term: 53 percent to 45 percent. In Bush's first term, however, the Republican advantage was 61 percent to 39 percent -- nearly three times as large.
In both the Clinton and Bush administrations, conservative journalists were far more likely to appear on the Sunday shows than were progressive journalists. In Clinton's second term, 61 percent of the ideologically identifiable journalists were conservative; in Bush's first term, that figure rose to 69 percent.
In 1997 and 1998, the shows conducted more solo interviews with Democrats/progressives than with Republicans/conservatives. But in every year since, there have been more solo interviews with Republicans/conservatives.
Here is the full report in pdf format