If he did not secure even half of the popular vote then it is obvious that the median voter does not align with his views.
We are explicitly talking about a mandate - the will of the median voter. Someone who did not receive even half of the popular vote is not representative of the median voter.
Just winning is not enough to receive a mandate.
If he did not secure even half of the popular vote then it is obvious that the median voter does not align with his views.