An example of media bias- during the Clinton years, the president was investigated for some time concerning a real estate investment that lost money, called Whitewater. The special prosecutor in the case, Ken Starr, expanded the reach of his office to include looking into Clintons private sex life. For about a year, Starr's daily actions in this case became constant news ,and his probe was a much discussed issue.
Now, Patrick Fitzgerald, a prosecutor from Chicago, has been investigating very serious criminal allegations against the Bush White House for over two years, and only just before the indictment of Scooter Libby was there any serious press coverage. Bush's crimes are well documented, and have resulted in the needless murder of over 100,000 innocent women and children.....

While Clinton's major policies were almost never substantially different from Reagans or the Bush's, Republicans still hated him- for generational and stylistic reasons. Concerning Bush, the national media is mostly muzzled.