What are those indications? Are these polls (which have already been proven totally unreliable in this election cycle)? Even if polls would have some credibility, I think they are totally meaningless at this point. Let's see some polls when the US is plastered with pictures of Sanders with a hammer and sickle as backdrop! Sanders is not a Clintonite liar, he won't deny being a Socialist!
Polling data has been pretty reliable, especially when consistent. People like pointing to the one or two upsets thus far, but they've overall been relatively accurate. And I don't think that'll change much when the "new polls" come out. Most of the country finds him genuine and agrees with most of his positions, even if we think he'd be horrible for America. There only are a handful of states that count, and if the republicans lose one of the key battleground states, they can kiss their presidential hopes goodbye due to the electoral math.