From a Chicago Magazine piece by David Bernstein from February 2008:
The governor's strange behavior has been fertile ground for local armchair psychologists (ed--and for quite a few real psychologists). Last summer, the downstate newspaper the Peoria Journal Star declared that the governor was "going bonkers." Privately, a few people who know the governor describe him as a "sociopath," and they insist they're not using hyperbole. State representative Joe Lyons, a fellow Democrat from Chicago, told reporters that Blagojevich was a "madman" and "insane." "He shows absolutely no remorse," says Jack Franks, the Democratic state representative. "I don't think he gives a damn about anybody else's feelings. He tries to demonize people who disagree with him; he's got delusions of grandeur."