Near the closure of the elections, the chances between the two candidates becomes 50/50. So odds for Clinton will become around 2.0. Currently her odds are between 1.4/1.5. Therefore, it's a good idea to bet against Clinton to become president. You can sell your bet near the elections at 2.0.
I don't know much but as far as it seems Clinton still has a high chance of winning. The only votes Trump will be getting is from his hardcore supporters all the Bernie and others supporters are likely to vote for Clinton.