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NEW YORK (

TheStreet

) -- Sen. Tom Harkin (D., Iowa) announced Saturday that he won't seek re-election in 2014.

In an announcement on his

official Web site

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, the liberal Democrat cited his desire to spend more time with his wife and his age.

"First, I'm going to fulfill a promise that I made to my wife Ruth, and that I also made to myself," Harkin said. "It's a promise that we're going to do certain things together -- and that we're going to live together in a way we've often talked about -- before it gets too late."

The junior U.S. Senator from Iowa Harkin also said that at the end of his current Senate term -- his fifth -- he'll be 75.

"When the current Congress is over, I will have served in the United States House of Representatives and the U.S. Senate for a total of 40 years," he said. "After 40 years, I just feel it's somebody else's turn."

Harkin served in the House of Representatives from 1975 to 1985 before beginning his first Senate term in 1985.

This article was written by a staff member of TheStreet.