She's ahead in the polls by roughly 3 to 4 points. Given her opposition, however, Hillary Clinton ought be doing a lot better than that.
Consider Clinton's structural advantages over Donald Trump.
Whereas top Democratic Party officials are so supportive of her that they even cheated to defeat her primary opponent, hundreds of leading Republicans — including the speaker of the House and the last two presidential nominees — have declared war against him. She's been wildly outspending him in televised political advertising. She has campaign field offices in most counties; he doesn't have any in most states. The news media despises him.