People take his endorsement to mean he's on board with what we stand for.. forgetting that RFK Jr. was running against Trump last week hoping to beat his/our policies. The enemy of our enemy is our friend? Maybe for votes but the guy does not stand for what we stand for and is riding the history of his family name.
Yes, it's happened before in our presidential elections. Bush Sr. presided over the certification of his victory as he was VP at the time of the election concluding Reagan's 2nd term.