Apprently, Presidential pardon powers are broad and rarely questioned. Clinton pardoned Marc Rich who had fled the US after filing of tax evasion and illegal trading with Iran charges against him. He was number two on the FBI most wanted list and had never been brought to trial since he had fled to Switzerland.
I heard a talking head on TV say that a president may even pardon someone after he leaves office. If Bush wants to pardon Cheney, Rove or even himself, he is free to do so and apparently can make it as broad as possible. As Governor, Bush pardoned very few people. No news here folks.
A simple primer......
http://people.howstuffworks.com/presidential-pardon.htm
What a Pardon is:
To fully understand what a pardon does, first consider that when a person is convicted of a felony, he loses his civil liberties -- the right to vote, serve on a jury, own a firearm. Living without certain rights is referred to as
civil disability.
What a pardon does is restore these rights. Customarily, an individual's civil abilities are restored through a pardon after the person has served his
prison sentence or paid his fine, but not always. (President Nixon was pardoned by President Ford before charges were even filed against him.)
Clemency is the term for the action taken by the president in a pardon. It can be any action of mercy granted to an individual convicted of a
crime that has some affect on the conviction or sentence. Acts of clemency include the president's power to pardon, commute and give respite and remission.
One limitation is that a pardon cannot be issued for a crime that has not yet been committed. Pardons also don't affect civil cases, or state or local cases. Pardons are meant to dismiss sentences stemming from affronts to the United States through the breaking of laws. They're not intended to relieve an individual from his responsibility to make restitution to a victim's family, for example, which would be considered a personal affront. So a presidential pardon of a criminal sentence would not relieve the defendant from paying restitution from a related civil case.