Shortly after his inauguration, President Ford issued a blanket pardon to former president Richard M. Nixon. As a matter of law, it does not seem to be clear whether a former president can be tried domestically for laws he may have violated while in office, unless he had been first impeached.
With respect to the vice president it seems likely that, once out of office, he may be charged with criminal conduct for acts committed during his term of office. See http://www.straightdope.com/...
for a discussion of these issues.
Consequently, I think that we, as progressives, should ask the field of potential candidates for the Democratic nomination whether, if elected, they would pledge not to issue any pardons whatsoever in any legal proceedings that might be brought against the chimp or uncle fester.