Tammy Baldwin and her partner Lauren Azar split

Rep. Tammy BaldwinTammy Suzanne BaldwinMcConnell: Midterms will be 'very challenging' for GOP Vukmir gets boost with Wisconsin Senate GOP primary endorsement  GOP senate candidate dismisses 'fake outrage' over remarks against Democratic veterans MORE (D-Wis.) and Wisconsin Public Service Commissioner Lauren Azar are ending their 15-year domestic partnership, according to a statement from Baldwin’s office.

In 2009, Baldwin and Azar were one of the first couples to register their same-sex partnership with the state’s domestic partnership registry. The statement said that domestic partnership will be legally terminated.

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Baldwin was elected to Congress in 1998, becoming the first openly gay woman in the legislative branch.

According to a spokeswoman, “neither Tammy nor Lauren will have any further public comment on this very private matter.”