I have not read every thread but here is the key.
“This NBC/WSJ poll was conducted (by telephone and cell phone) Oct 25-29 of 400 GOP primary voters, and it has a margin of error of plus-minus 4.9 percentage points.”
400 people nationwide. Give me a break. The Florida poll showing Trump way ahead had well over 2000 voters in one state. This is purely an agenda driven poll.
There is nothng unusual about that size of a sample for a primary election.
The range of turnout for primaries is 26% of registered voters as a high in Montana to a low of 9% of registered voters in Iowa (2014 primaries).
The latest poll from a conservative leanng polling organization and media outlet (Investors Business Daily/TIPP poll) had a sample of 402 registered Republcans or Republcam leanng Independents.