Another reason for neocon Bush supporters to back Clinton:
It didn't feel reckless to Hillary to repeat this lie over and over again, and she paid no heed to those who contradicted her, because in her mind, she was telling the truth. Only when confronted with undeniable evidence of external reality -- actual footage from her Bosnia trip - did she admit (possibly to herself as well as the public) that her version of events was not true.
It also explains Hillary's reaction when exposed. She was angry because she was forced to abandon her psychic reality for external reality. For her, this was tantamount to giving up the truth in exchange for mere facts.