According to the RCP average Trump's favorability rating on election day was 21 points underwater. I don't think Clinton needed to make Trump look any worse in the eyes of voters, she needed to make herself look better.
The dems based their campaign strategy on the courtship of suburban republican women. 'Donald would be such a bad role model for your children, vote for Hillary!'.
Cruz and Jeb had similar unfavorables as Hillary (and they were the 2 most well known candidates besides Trump), she wouldn't have run this type of campaign against them. A lot of that is simply due to political polarization.
Agreed. To me, the most frustrating part about this is that it was all in her platform, she just didn't place enough emphasis on economic populism.