First, it is not a contradiction. Minorities are not a monolithic voting block. They come from different backgrounds, income levels and religious beliefs, all of which have a bearing on their support, or non-support towards a candidate. Bernie Sanders is a honourable man, but his single-issue campaign does not resonate with voters that are more affluent, more conservative or older (45 and above), those who reliably turn out on November every four years and are now the bedrock of Clinton's support. He's campaigned for the best part of a year, and as of right now has failed to capture that support, and got beaten soundly in swing states with large EV count critical to the Dems's chance come November (FL, NC, VA, OH). And yet, at the same time, he's not has a single cent spent against him from the GOP, as opposed to Clinton who was under that scrutiny for 25 years and was literally the reason that instigated Citizen United. I certainly can't say that he won't capture their support should he becomes the nominee, but their support cannot be taken for granted, just as the progressive wing's votes. Lower than expected turn out amongst these demographics can make it very complicated against the GOP.
Secondly, if you think the GOP merely 'smear', you are sadly mistaken. Dukakis by all account was an upstanding citizen, he got turned into a criminal sympathiser. John Kerry was a war hero, he was portrayed as a coward. That smear machine from the GOP is a real thing and it does not lack for practice, and there are vast swaths of Middle America who is dead set against a tax raising, big government, socialist Jew who praised the Castros and honeymooned in the USSR. By every metrics, the US is a centre-right country with a latent strain of nativism running in their psyche and national discourse. Look to George McGovern and see what kind of support a true left candidate can expect. On the other hand, the Clintons, and in particular, Hillary, haven gotten the kitchen sink thrown at them time and again, and they got the connections, financial backing and name recognition to combat it. Hillary Clinton is not personally under investigation by the FBI and that distinction is not lost on the non-GOP electorate. Favourability is a fleeting thing. She had a 60% positive rating back in 2013. Now it's what, 38%? Relying on a metric that is literally changing by the day and subjected to the whim of an electorate susceptible to fearmongering to choose your nominee is hardly a great strategy. 9 in 10 Dems and the majority of Democratic elected officials think that she's the better candidate, and they had no problem ditching her in the recent past. Harry Reid urged Obama to run, gave patronage to Elizabeth Warren and he's been behind her from the beginning of this cycle. If you think they support her purely out of loyalty to the Clintons then really, you are doing all of us a disservice.
I think none of us so-called Clinton supporters in this thread, be it me, Ubik or Raoul are burying our heads in the sands. I can't speak for either of them, but for my part I've made it clear numerous time in this thread that while I respect her achievements, I'm not personally invested. Her hawkish foreign policy and coziness towards the fecking butcher Kissinger, who had the blood of my countrymen on his hands turn me off greatly. The one I want to be running is Liz Warren, but it's not the case. My only interest in this race is to see a Democrat in the White House who has a shot of being elected again in 2020, a redistricting year, and if it's Hillary Clinton, so be it, because the world cannot afford another Republican ideologue in the most powerful post on Earth.