Question: Which political party did the person who said "Seriously, I do not think I fit for the presidency" belong to?
Answer(s):
answer: Republican Party
answer: Whig Party
answer: National Union Party
answer: Illinois Republican Party

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ?c)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
?c ns:people.person.quotations ns:m.048jc3k . 
?c ns:government.politician.party ?y .
?y ns:government.political_party_tenure.party ?x .
}