From the latest Quinnipiac, it's pretty clear that people view Trump as honest and trustworthy as Hillary, which is not a good place for him to be:
They are also both underwater among registered voters in terms of net favorability:
It seems to me that Trump is only able to hold his own against Hillary in head to head matchups not because he is so good but because she is so bad. He gets crushed though by Biden by a whopping 11 points in this poll and even loses to Sanders by 5 points. We need to make sure we nominate someone with positive net favorables to even have a chance.