Question: When was the actor who portrayed  Cmdr. Casey Abbott sworn in as president?
Answer(s):
answer: Ronald Reagan 1981 presidential inauguration
answer: Ronald Reagan 1985 presidential inauguration

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:film.actor.film ?k .
?k ns:film.performance.character ns:m.0t4xg8x . 
?c ns:base.inaugurations.inauguration_speaker.inauguration ?x .
}