Sen. John Kerry D-Mass., speaks with actor Ben Affleck during a meeting with foreign relations members to discus the crisis in the Democratic Republic of Congo on Capitol Hill in Washington on Wednesday. (Jose Luis Magana/AP)

No Ben Affleck? That's OK, Massachusetts Senate race still poised to be big.

2:52 pm ET -

If John Kerry's seat needs to be filled next year, it will be the fourth time Massachusetts voters have chosen Senate candidates in a six-year period. Actor-director Ben Affleck said Monday he won't run.

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