Not so sound shallow, but "Biden" in writing reminds me of Osama's surname. So if he is really the choice, their campaign bumper sticker would be too much:
Obama/Biden
Osama bin Laden.
Is it just me?
Salve, Regina, Mater misericordiae
Vita, dulcedo, et spes nostra
Salve, Salve Regina
Ad te clamamus exsules filii Eva
Ad te suspiramus, gementes et flentes
O clemens O pia