Polls open for Senate primary in Mass.
Voters are heading to the polls right now in Massachusetts for a primary vote to pick candidates for a special election to fill John Kerry's U.S. Senate seat.
Kerry is now secretary of state.
Three Republicans and two Democrats are vying for the position.
Polls opened at 7 a.m. and will close at 8 p.m.
The winners of the vote -- one Republican and one Democrat -- will face off in the special election set for June 25.

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