Though Canadians compose blogs on many topics, weblogs of a political nature are very popular in Canada. Former prime minister Paul Martin kept a high-profile blog during his campaign for leadership of the Liberal Party. Monte Solberg kept a widely read blog while he was in opposition, but ended blogging after being named Minister of Citizenship and Immigration. Former Jean Chrétien advisor, Warren Kinsella's blog enjoys a similarly high profile. The contents of political blogs have been used to both defend and attack politicians in Parliament. Canadian comedian Rick Mercer also keeps a blog that frequently pokes fun at Canadian politicians.