However, her victory would've been utterly marred because of the other unfavorables. At best, she'd would've ended up like Bush Sr and just a had mediocre presidency in frustrating gridlock...only to be taken out in 2020, a loss far costlier than this.
At worst, she'd end up like Richard Nixon [instead she's more like Richard Nixon was to Democrats before Watergate] and actually do something awful out of sheer paranoia.
I don't know what's worse: losing now or losing later.
Even if Comey didn't sent the letter and even if she barely won, Republicans would likely run a half-sane opponent and beat her in 2020.