It would be silly to think there wouldn't be an attempt of some kind. I don't like to say it but I think an attempt is inevitable due to the change he represents to the US. Once you factor in all the different extremist groups that wish him harm, whether it be because of his race or what he represents as the american president, it seems unlikely that over the course of his presidency some crack-pot won't give it a go. I think his security detail will be exceptional though. I'm sure he is aware of the risks associated with being the president, let alone the first black president. I hope he has a very successful term though, and I hope he brings into light some of the positive changes that America clearly needs.