http://mediamatters.org/items/200602140002
..this study reveals, conservative voices significantly outnumber progressive voices on the Sunday talk shows. Media Matters for America conducted a content analysis of ABC's This Week, CBS' Face the Nation, and NBC's Meet the Press, classifying each one of the nearly 7,000 guest appearances during President Bill Clinton's second term, President George W. Bush's first term, and the year 2005 as either Democrat, Republican, conservative, progressive, or neutral. The conclusion is clear: Republicans and conservatives have been offered more opportunities to appear on the Sunday shows - in some cases, dramatically so.
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.