Straddling the Country?

Confused. CNN has this caption on its front-page photo today at 1:30:

Kerry arrives to vote in Boston.

But I could swear I already read a story today that Kerry voted in Wisconsin--which, granted, makes little sense, but still. Anyone have any light to shed on this? I can't find a Wisconsin mention now...

And I'm doubting, as gargantuan as he is, that Kerry is pulling levers in both states. Then again, maybe that's the key to it all...