The current debate over who should be Vice President Biden’s running mate this fall is likely to be settled in a week or so when Biden announces his choice. It is a remarkable feature of our ever evolving and largely unwritten constitutional system that this choice is left to him entirely alone, each of the contenders proclaiming that they will be satisfied to be spear carriers in his campaign if that is the role assigned to the. And yet the choice is likely to be very significant, given his age. His Vice President may well ascend to office either by death or because Biden does not run for a second term and his Vice President would therefore have an inside lane for the nomination in 2024. But the Vice Presidency has become something at the disposal of the nominee for over a very long time reaching back into the early Nineteenth Century and has, if anything, become even more so now that the Vice President, since Jimmy Carter was President, has significant responsibilities and so the President is likely to want someone with whom he feels comfortable and who shares his basic policy viewpoints.