I think after New Hampshire the Clinton campaign decided that Hillary Under Fire was a useful narrative and they're clinging to it like grim death, facts be damned.
Most people have very little exposure to the news, so if you can get a 50/50 split out of the coverage in headlines, first paragraphs, and 30-second news spots, you're fine. Hm, maybe inverted pyramid style is what's really killing political discourse in this country.