(CNN) - Get ready Massachusetts: Another special election to fill a U.S. Senate seat may be coming your way. And jockeying is already underway among potential candidates, even before it's official there will actually be vacant seat and an election.

With U.S Ambassador to the U.N. Susan Rice no longer in contention to succeed Secretary of State Hillary Clinton as America's top diplomat, President Barack Obama had decided to nominate Senate Foreign Relations Committee Chairman John Kerry, always one of the top contenders for the job, a Democrat who spoke to Kerry told CNN Saturday.
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