After months of speculation about her future, Barbara Boxer finally picked one person to break the news of her decision: her grandson, Zach. In a mock interview post on her website, the longtime California Democrat announced she will not run for reelection when her seat is up in 2016.

She told Zach that while she is retiring from the Senate, she will continue to be active in politics and fight for the issues she cares about, such as environmental issues and abortion rights. She wrapped up the “interview” with a rhyme about the decision and her time in the Senate.

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Boxer’s retirement opens a California Senate seat for the first time in more than 20 years (she took office in 1993, a year after fellow Californian Dianne Feinstein did). The seat is considered safely Democratic, and two of the party’s rising stars — Attorney General Kamala Harris and Lieutenant Governor Gavin Newsom — are expected to be favorites as a potential replacement. Billionaire environmentalist Tom Steyer, who spent millions backing Democratic candidates in the 2014 midterms, has also been floated as a potential candidate. There is no current Republican front-runner.