He has a better than zero chance, but it would require all of the other candidates to be killed, simultaneously, a few days before Super Tuesday, with Trump being the only living candidate left in the race.
People don't like him:
While Mr. Trump is experiencing a bump in popularity after announcing the launch of his campaign last week (he filed formal Federal Elections Commission paperwork Monday), he remains the most disliked GOP candidate in the field. Suffolk found he is the only GOP candidate with a net unfavorable rating in New Hampshire — 37% of those surveyed had a favorable opinion of Mr. Trump, compared to 49% who had an unfavorable view.
The candidate with the largest gap between favorable and unfavorable ratings is Mr. Rubio, at 61% favorable to 14% unfavorable. Mr. Rubio was also chosen as the second choice by 13% of poll respondents. Mr. Bush was the second-choice pick of 14% of those surveyed.
The poll of 500 likely New Hampshire Republican presidential primary voters was conducted from June 18, the day after Mr. Trump announced his campaign, through June 22. It has a margin of error of plus or minus 4.4 percentage points.