Simple question: Would you vote if you had to donate blood in order to do so or present a medical waiver that you are unable to donate blood?
For the correct candidate. At this point, it would be so good to see one that a little blood loss would be nothing in exchange. Understood, I'm speaking for me alone, not demanding it of anyone.
I give blood every eight weeks so I would have no problem doing so. However, the bigger question is what is significance of tying it to voting? Where are you going with this?