Washington (CNN) Todd Palin has filed for divorce from Sarah Palin, the former governor of Alaska and 2008 Republican vice presidential candidate, after 31 years of marriage.

In a document filed Friday in Anchorage, Alaska, Superior Court, Todd Palin cites an "incompatibility of temperament" in his marriage to Sarah Palin "such that they find it impossible to continue to live together as husband and wife." The divorce filing and court records use only initials to refer to the pair, with Todd Mitchell Palin listed as TMP and Sarah Louise Palin only identified as SLP.

Neither Sarah Palin nor Todd Palin or his lawyer has returned CNN's requests for comment. The divorce filing was first reported by Alaska blogger Craig Medred.

Friday's filing includes a child custody jurisdiction affidavit for the family's youngest child, who is 11. The affidavit is a standard form in divorces in Alaska involving minor children that includes information about children who will be involved in custody proceedings.

Palin served as governor of Alaska from 2006 to 2009 and shot into national prominence in the summer of 2008, when the late Sen. John McCain picked her to be his running mate in the presidential race, which he would eventually lose to Barack Obama.

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