While delaying may not be moral, it is actually a move that is strategically sound... he delays long enough to win the election he can no longer be persued in court until his presidency is over. So yea it makes a lot of sense wrt his best interests.
Actually if he is found guilty before he wins I am pretty sure he would have to serve his sentance... not too sure.. I mean maybe he can pardon himself? I know they cant try a president, but not sure that is the same as saying one who was found guilty before being elected cant be put in prison... i dunno