No (since you're assuming that the referendum was called with a
political action card).
6.3.3:
"If a political action card was used to call the referendum, that
card provides a vote for the acting vampire's controller."
and
"Each Methuselah can gain no more than one vote from political action
cards"
> ...or can you ONLY GAIN ONE EXTRA VOTE through use of a political card
> whether you're the one who called the vote or not?
Correct, although the "extra" probably shouldn't be there.
> 2) When calling a Blood Hunt, does the Methuselah calling it get +1 vote
> automatically?
No, since "this referendum is handled just like any other" (6.5.6.)
> Can you burn a political card to get a vote?
Yes, since "this referendum is handled just like any other" (6.5.6.)
--
L. Scott Johnson (vte...@wizards.com) VTES Net.Rep for Wizards of the Coast.
Links to revised rulebook, rulings, errata, and DCI (tournament) rules:
http://www.wizards.com/VTES/VTES_Rules.html