Polls gauge popular vote. One can win the popular vote and still lose the electoral college vote.
If Hillary has the right votes, she can win the election without a straight majority.
Yes, but if Trump has the right votes, he can also win the election without a straight majority. The point is that this is a winnable election for Trump. Very winnable it seems. Polls are like the chicken and the egg - hard to know which came first (i.e. polls pushing the vote vs reflecting the vote). It really doesn't matter IMHO. For the record, however, the situation in which the person winning the popular vote didn't win the electoral vote and thus the presidency has happened only 4 times in American history. Three of those were in the 1800s, the last one was 2000, and the Republican (GW Bush) wound up winning the presidency. If you support Trump, you should be happy. Things are looking up.