No. Trump carries some negatives. The other candidates do not because they have not yet been identified. Stalin would get 45% of the vote in the democrat party, just to start. Let me put it this way: Once a candidate is actually labeled with conservative values then a person actually has a choice. You cannot place ‘blank sheet’ and ‘choice’ at the same time. The same applies to ‘second choice’ in the Republican poll. There really can’t be a second choice as long as your first choice is there. It is all talk show fodder until people actually have to make a choice between things that are actually known.
Negatives are meaningless until the General Election.
Supporters of Trump for instance will likely be negative toward Cruz during the primary.
There are some polling data that are out their for scientific polling, there are some for entertainment purposes and there are some out there to influence and shape.