Apparently, the myriad violations of the Constitution carried out by the Bushies warrant an investigation. But criminal prosecutions? Convictions? We wouldn't want to be rude.
From Salon.com:
Aug. 4, 2008 | WASHINGTON -- On the campaign trail in April, Barack Obama was asked whether, if elected, he would prosecute Bush administration officials for establishing torture as American policy. The candidate demurred. "If crimes have been committed, they should be investigated," he said. But he quickly added, "I would not want my first term consumed by what was perceived on the part of the Republicans as a partisan witch hunt, because I think we've got too many problems to solve."
Too many problems to solve, indeed. Like torture, for instance -- and also unlawful imprisonment, warrantless spying, war profiteering, an illegal invasion, election theft, voter fraud, politicization of Cabinet departments, signing statements, the outing of covert agents, and on and on and on ...
And here's the would-be President, worried about what might be "perceived on the part of the Republicans as a partisan witch hunt." Because that would be, y'know, rude.