The Biden-Trump debate ended in a draw in my opinion.
But Trump desperately needed a decisive win to close the gap of several percentage points indicated by the polls (if you believe the polls). As time passed and the exchanges became more vitriolic instead of firing shots at his opponent on Obamagate, the influence of AOC and the sanderistas, the Green New Deal, the irresponsible fiscal plan, etc. Trump became increasingly obnoxious and petulant.
If Trump had highlighted the scandal of Hunter Biden paid 50,000 dollars a month for a synecure in Ukraine during one of the two-minute slots he would have dealt a severe blow to the Democratic candidate. On the contrary, in the vicious dog fight he continually triggered, the power of the argument was lost.
Moreover for months Trump had been insinuating (not without reason) that Biden is suffering a mental decline and is stuffed with drugs. Instead old Joe proved pugnacious and well alert. He did not commit any major mistakes and therefore his lead in the polls would hardly be dented by his performance yesterday night.
The political battle will move to the Senate where the hearings on the confirmation of Amy Coney Barret to the Supreme Court will reach new hights of brutality.