There is an old saying that if you don’t blow your own horn, there won’t be any music. Gov. Andrew Cuomo obviously is a believer, having ended his streak of 111 daily coronavirus briefings with another blast of praise for himself. From March 2 until Friday, he held forth in marathon appearances that boosted his political ratings. Early on he hit an incredible 87 percent approval in the state and an April poll found that 56 percent of national Democrats wanted to dump Joe Biden and make Cuomo the presidential nominee.