ANCHORAGE, Alaska — Sarah Palin’s husband, commonly referred to as “Alaska’s first dude” when she was governor, appears to be seeking a divorce from his wife of 31 years.

Paperwork believed to be from Todd Palin cited “incompatibility of temperament” in seeking to end his marriage to the 2008 Republican vice presidential nominee.

The filing Friday in Anchorage Superior Court only identified the couple by initials. The initials, birthdates and wedding date match the Palins, as does the initials given for their only young child.

The documents list the minor as T.P.V.P., born April 18, 2008, the same date Sarah Palin gave birth to Trig Paxon Van Palin, the youngest of the couple’s five children.

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