Getting someone to prosecute corrupt politicians effectively is a hard thing, but for Bush, getting someone to not prosecute them is apparently harder:

The Bush administration has quietly asked San Diego U.S. Attorney Carol Lam, best known for her high-profile prosecutions of politicians and corporate executives, to resign her post, a law enforcement official said.

Lam, a Bush appointee who took the helm in 2002, was targeted because of job performance issues – in particular that she failed to make smuggling and gun cases a top priority, said the official, who declined to be identified because Lam has yet to step down.
Lam has had high-profile successes during her tenure, such as the Randy “Duke” Cunningham bribery case – but she alienated herself from bosses at the Justice Department because she is outspoken and independent, said local lawyers familiar with her policies.

When she took over, Lam made it clear that she planned to focus less on low-level smuggling cases in favor of public corruption and white collar crime, which would mean fewer but more significant prosecutions.

Yeah – because smuggling or gun cases are a far greater risk to our nation than people like Cunningham taking bribes in Congress. This sounds like another example of Bush circling the wagons.