Tom Carper is going to retire, creating a safe Democratic seat in the Senate for Rep. Lisa Blunt Rochester.

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Rep. Lisa Blunt Rochester (D-Del.) is the clear frontrunner to succeed Tom Carper as he prepares to leave office after serving four years.

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Tom Carper declared on Monday that he would not run for re-election to the Senate, freeing up a safe Democratic seat in Delaware for the coming election.

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During his retirement announcement, Carper backed Blunt Rochester, making the transition for First State Democrats easier.

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Carper, a low-key but powerful senator, chairs the Senate Environment and Public Works Committee and previously chaired the Homeland Security Committee. 

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As a member of Congress and as Delaware's Treasurer, he played a key role in the Democratic Party's rise to power in the state.

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Carper debated whether or not to run for re-election in 2018 for a fourth term since he anticipated a contentious primary to succeed him.

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Sen. Chris Coons (D-Del. ), Carper's colleague, said the senior senator's long career "made a lasting difference for our state and nation."

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On Monday, following Carper's declaration, Senate Majority Leader Chuck Schumer called with Blunt Rochester.

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Additionally, Carper's retirement will leave at least one opening in the Democratic leadership of the Environment and Public Works Committee in 2025.