I believe Spain may have already granted chimps voting rights:
Spain's Socialist Party Wants to Give Apes Rights
The Socialist Party is trying to pass a parliamentary initiative that includes simians in the category of "people" and, thereby, grant them legal and moral protection. Under the measure, apes would be put on a par with handicapped people.
Spain's Prime Minister, José Luis Rodríguez Zapatero, defended the initiative as the "next logical step in the evolution of Spanish socialism." "The boundary between man and ape is an arbitrary one," said Zapatero. "Many in the human race share a large number of traits with the apes. Where should we draw the line? Why should we draw a line?"
Zapatero said he is confident that granting voting rights to apes is feasible. "Apes have the manual dexterity to mark ballots," said Zapatero. "There is no physical barrier to their participation in selecting who will govern Spain."
The conservative Popular Party's opposition to the legislation was dismissed as partisan. "The conservatives know that this newly empowered under-privileged segment of our society is likely to vote Socialist," said Zapatero. "Their opposition is driven by pure partisanship. We, on the other hand, are merely trying to extend the blessings of democracy to a wider constituency. We socialists believe apes need to have a voice. We are ready to listen to that voice."
Zapatero said the extension of rights to apes may not be the last expansion of the franchise. "Researchers recently announced that starlings can apparently recognize the grammatical concept of adding sounds to produce a more complex song" said Zapatero. "Adding sounds to produce a more complex song has been my path to political success."
Zapatero agreed that the logistics of casting a ballot would be more complex for birds than apes, but says he is optimistic this difficulty can be overcome.
read more...
http://www.azconservative.org/Column_Archives.htm
It reads like satire, but on the other hand, it IS Spain.
I'm going to come down on the side of PLAUSIBLE.
Oh glorious Spain! I can finally marry my chimp lover!!
That's just because the socialists want to broaden their voter base.