No it wont really, anything can happen in the last few weeks.
They did a similar thing last year at around this stage: they asked the public who do you think deserves to win? Gina came top with sam second and dexter third. Albeit it wasn't that different to the finishing order but we all know it hardly 'gave away' the winner.
The person who comes second in this poll has a higher chance of winning than the winner, as the voters who win will become complacent, and the voters who nearly win will become more hungry.