While the concept is novel, I think it fraught with the possibility of mischief. For instance, the VP in his capacity as President of the Senate may be called upon to cast a deciding vote. Does he cast his in favor of the President's wishes, his party's preference, or his own conscience? The original manner of selecting the Pres./VP was based on which candidate received the most electoral votes (chosen by a process that then meant something, as opposed to today's selecting electors), and the runner up becoming VP, which resulted in Jefferson having a VP, Burr, not of his party. I believe, without looking it up, the Constitution was amended so that both ran as a ticket...although I guess they don't actually have to be of the same party. Was there not some talk of trying to get Liebermann to run for VP with McCain in the last election?

I think a better change...if one wants change...is to run each office separately, as in California we vote for Gov. & Lt. Governor. Then the people have two clear choices for the Executive Branch offices, and have many combinations to choose from.