Best explanation is that Russia probably wants Trump to win, because they know how democrats will respond. They probably would love for Bernie to win, as the same response would come from Republicans. How much time and influence and money has been wasted trying to attack Trump. As the old biblical statement says, a house divided can not stand. The best way to help destroy America is from within.
Under those circumstances, they most certainly would be pushing for both a Democrat and a Republican.

A few months ago I stumbled into a face book page from an activist from Chicago. The thread was arguing about a black shop lifter who was shot and the thread degraded into a race war and how all white people should be killed. About half way through, it occurred to me that there was no way to know who, in the responses was real and who could be just trying to build up division, or even how I had been directed to the thread. It appears that Russia and China now have huge efforts to infiltrate and influence ever aspect of our social media.