On his previous TV series, "Politically Incorrect", he used the word "libertarian" to describe his political leanings. Regarding religion, he considers himself a "rationalist", as someone "preaching the gospel of 'I don't know. Maher identifies himself as politically unaffiliated and disagrees with the Republican party on many issues, and with the Democratic Party on many of their party platform's planks. He endorsed the candidacy of Ralph Nader of the Green Party in the US presidential campaign of 2000. After the 2000 election, Maher was among those who felt that votes cast by progressives for Nader possibly cost Democratic candidate Al Gore the election, and put GeorgeW. Bush in the White House. During an episode on which Nader and Michael Moore were guests, both Maher and Moore begged Nader not to run again in 2004 (season 2, episode 11). He endorsed Democratic presidential candidate John Kerry leading up to the 2004 presidential election. In 2008, he endorsed Democratic presidential candidate Barack Obama and harshly criticized Republican candidate John McCain's political campaign. He also heavily criticized McCain's vice presidential pick, Sarah Palin, on her qualifications and intelligence. Maher interviewed then presidential-candidate, Republican Ron Paul, giving him some positive air time. He often cites Paul's views in order to demonstrate the diversity of views on the right.