If the other candidates' performance "simply reflects and [sic] anti Hillary vote," then wouldn't it be the case that Trump's performance also reflects whatever anti-Hillary sentiment exists in the electorate? So, Trump is losing to Hillary in the polls, notwithstanding the anti-Hillary vote?
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.