I've never even heard of Breitbart polling people, but how far off do you think it is? Is it more than 5 points off? Then it means Clinton by 1 or more in CO? How far off are you claiming?
Objectively, they are considered a B- polling outfit that has a 1.1% Republican house effect lean.
Realistically, there is a weird conflict of interest, considering that one of the top bosses is now embedded in the top of the Trump campaign.
Gravis historically has a pretty bad rep on the forum, because of their extremely poor polling history back in 2012 and before.
Now, unlike many others on the forum, I think that although they are generally a junk pollster, that they are not complete hacks, although the CW says that historically they are crappy pollsters...
So trying to present in a fair and balanced layman format....