Conversation so far:
When did Dan Quayle get his start in politics?
In 1976 Dan Quayle was elected to the House of Representatives from Indiana's 4th congressional district.
What did Dan Quayle do after being elected to the House of Representatives?
In 1980, at age 33, Dan Quayle became the youngest person ever elected to the Senate from the state of Indiana.
What did Dan Quayle do after being elected to Senate for the first time?
Dan Quayle was reelected to the Senate in 1986 with the largest margin ever achieved to that date by a candidate in a statewide Indiana race.
What were Dan Quayle's ambitions early on?
What did Dan Quayle accomplish as a senator?
In 1986 Dan Quayle was criticized for championing the cause of Daniel Anthony Manion, a candidate for a federal appellate judgeship, who was in law school one year above Quayle.
What did Dan Quayle supporters like about him?

Question: What kind of unsafe conditions?
Self-contained rewrite: What kind of unsafe conditions were proposed to be investigated by Dan Quayle?