Todd Palin appears to have filed for divorce from former Alaska governor and one-time vice-presidential candidate Sarah Palin, his wife of 31 years. In a document filed Friday in Anchorage Superior Court, Todd Palin, 55, asked to dissolve the marriage, citing an “incompatibility of temperament between the parties such that they find it impossible to live together as husband and wife.” The divorce filing uses initials rather than full names, but identifies the couple’s marriage date and the birth date of their only child who is a minor, Trig Palin. The filing asks for joint legal custody of the child.