If one goes by British betting odds, the list of potential Democratic Vice Presidential nominees is as follows:
In front is Julian Castro, former San Antonio Mayor, who is presently Secretary of Housing and Urban Development; followed by Massachusetts Senator Elizabeth Warren; Virginia Senator Tim Kaine; Secretary of Labor Tom Perez (from Maryland); and former Maryland Governor Martin O’Malley (who was in the Democratic Presidential race).
After those five, the odds on others, in their order, are New Jersey Senator Cory Booker; Ohio Senator Sherrod Brown; and then Minnesota Senators Al Franken and Amy Klobuchar.
Looking at the list, the “safest” choices to make are Castro, Perez, O’Malley, Franken, and Klobuchar, as the first two are cabinet members and not potentially giving up a Senate seat; O’Malley is out of office; and Franken and Klobucar come from a solidly “blue” state that has a Democratic Governor able to appoint a Democratic replacement were either to be elected Vice President.
Warren and Booker come from states with Republican Governors, who would be able to appoint a Republican temporarily as their replacement, while Kaine and Brown comes from “swing states” with a Republican governor in Ohio, and a Democratic Governor in Virginia now under federal investigation in a state which would be Republican if not for northern Virginia’s strong Democratic bent.