Question: Which politician reported the "piggate" anecdote?
Context: John Ssenseko Kulubya, is an engineer, businessman, and politician in Uganda.  He was reported in 2012 to be one of the wealthiest people in that country. Mukesh Shukla, commonly referred to as Mukesh, is a businessman, entrepreneur, and politician in Uganda.  He was reported in 2012 to be one of the wealthiest individuals in Uganda. Michael Anthony P. Ashcroft, Baron Ashcroft, (born 4 March 1946) is a businessman, and politician.  He is a former deputy chairman of the Conservative Party.  Ashcroft founded Michael A. Ashcroft Associates in 1972 and is the 74th richest person in the UK, as ranked by the "Sunday Times" Rich List 2015, with an estimated fortune of £1.32 billion. The Great Stockholm Fire of 1759 was the city’s greatest fire since 1686.  It raged in the Eastern Södermalm on Thursday July 19 and over the following night, reduced about 20 blocks with about 300 houses to ash, and rendered about 2000 persons homeless.  While no deaths were reported, there were 19 injuries.  In Sweden, the fire is named "Mariabranden" (Swedish "brand" = fire) after the Maria Magdalena Church, which was severely damaged.  Outside Sweden, the fire is most famous because an occult anecdote claims the scientist and mystic Emanuel Swedenborg by a sort of clairvoyance could ”see” the fire from Gothenburg. Tommy Tabermann (3 December 1947, Ekenäs – 2 July 2010, Helsinki) was a Finnish contemporary poet and politician, radio personality and journalist.  Since 1998 and until 2006 he was known to Finnish audiences for his witty role as team captain in the weekly Saturday night television show "Uutisvuoto", the Finnish version of "Have I Got News For You", opposite the bestselling author Jari Tervo.  Tervo recently characterised his popularity with the following anecdote: "When he was sixty, nine out of ten persons in an elevator at the Stockmann department store (in Helsinki) recognised him.  The tenth person was Japanese." Tony Aimo (born 24 August 1960) is a Papua New Guinean politician.  He was a member of the National Parliament of Papua New Guinea from 2002 to 2012 and again from 2012 to 2013, representing the electorate of Ambunti-Drekikir Open.  He was Minister for Correctional Services under Michael Somare from 2007 until 2011, although he was stood aside for three months in 2010.  A long-time People's Action Party member, he was briefly reported to have joined the Papua New Guinea Party following the fall of the Somare government, only to emerge as a member of Somare's National Alliance Party. The Sense of Beauty is a book on aesthetics by George Santayana.  The book was published in 1896 by Charles Scribner's Sons, and is based on the lectures Santayana gave on aesthetics while teaching at Harvard University.  Santayana published the book out of necessity, for tenure, rather than inspiration.  In an anecdote retold by art critic Arthur Danto of a meeting with Santayana in 1950, Santayana was reported to have said that "they let me know through the ladies that I had better publish a book... on art, of course.  So I wrote this wretched potboiler." Nouri Abusahmain (Arabic : نوري أبو سهمين) is a Libyan politician.  He is a major figure on the Islamist side of the 2014 Libyan Conflict and founder of the LROR group which is considered "terrorist" by the internationally recognized Libyan parliament.  He is reported to have rigged proceedings of the General National Congress while serving as its president. "Piggate" refers to an uncorroborated anecdote that during his university years former British Prime Minister David Cameron put a "private part of his anatomy" into a dead pig's mouth as part of an initiation ceremony for the Piers Gaveston Society.  The anecdote was reported by Michael Ashcroft and Isabel Oakeshott in their unauthorised biography of Cameron, "Call Me Dave", attributing the story to an anonymous Member of Parliament who was a "distinguished Oxford contemporary" of Cameron's.  Extracts from the book were published in the "Daily Mail" on 21 September 2015, prior to its publication. Joseph Kalite (died 24 January 2014) was a Central African politician.  As a government minister he either held the housing or health portfolio.  Kalite, a Muslim, was reported to be killed by anti-balaka outside the Central Mosque in the capital Bangui during the Central African Republic conflict.  He was killed with machetes on the day in Bangui after interim president Catherine Samba-Panza took power.  At the time of the attack Kalite held no government position, nor did he under the Séléka rule.  He was reported to have supported the rule of Séléka leader Michel Djotodia.
Answer: Michael Ashcroft