No polling data supports that; certainly, early polls aren't guarantees of final results, but they are a pretty good indicator of what people want now.

> Sanders will never get in running as a 'socialist'

Perhaps. Certainly he's rightly perceived as an underdog in the Democratic race.

> All of the polls show the GOP ahead.

While early polls aren't particularly useful, that's simply not true. Every 2016 head-to-head poll shows Clinton beating every GOP candidate she is polled against (with the wide lead she currently has in Democratic primary polling, very few pollsters is doing head-to-head polls featuring any of the other Democratic nominees.)

> Trump hasn't even effected the Hispanic vote with his crude comments

The one Nevada poll usually cited by Trump and his supporters to make that claim [0][1] just shows that (with a very small Hispanic subsample, so wide margin of error on the figures), Trump is the lead candidate among Hispanic Republicans in Nevada by a slightly larger margin than he is the first choice of Nevada Republicans more generally.

[0] cited on RedState for that claim here: http://www.redstate.com/2015/07/24/polls-indicate-trump-hurt...

[1] cited by Trump also, as this article notes with details about why it doesn't actually support the claim: http://www.washingtonpost.com/blogs/the-fix/wp/2015/07/23/th...