According to CNN just now a Time poll for a hypothetical McCain-Clinton race has it at 49% McCain 47% Clinton. Given the sycophantic press McCain always gets it's actually interesting that such a thing would be within the MOE.
Clinton doesn't get bad press overall - it's a bit of a mix - but is nonetheless often associated with "divisive" or "polarizing" or "love her or hate her" kind of rhetoric. As is almost always the case with issues or people who "divide the country" such descriptions are completely arbitrary and could apply to just about any well-known person or issue. How often does such rhetoric get applied to George W. Bush for example?