LARRY KUDLOW: President Trump's RNC was a knockout punch to the Biden Democrats

President Trump's RNC was a knockout punch to the Biden Democrats and that's the subject of the riff.  Besides Joe Biden's bad health, and his awful performance in the debate, and his bad polling numbers, I think the final knockout punch for Biden leaving the race was the incredibly successful Republican National Convention in Milwaukee. That's right, the RNC was the final knockout punch for Mr. Biden. 

The convention was so positive, so optimistic, so united, so well-messaged, that leading...