Let's not confuse national polls with probability of winning the electoral college and therefore becoming President. The latter is still showing a ~74% chance Clinton would be the next President, if the election were held today.
http://projects.fivethirtyeight.com/2016-election-forecast/?ex_cid=rrpromo
Trump's probability has doubled from ~13% a couple weeks ago to ~26% today! I'm guessing his low energy odd photo op with the Mexican President yesterday, followed immediately by his HIGH energy bombastic contradictory speech in AZ last night might cause his poll numbers some pain.