Mr Mallon, 65, moved to quell speculation that he would be the natural successor to the Nobel prize-winning Mr Hume within 24 hours of the leader's resignation.
Carr has confirmed weeks of speculation that he is leaving politics following Labor's election defeat on 7 September.
Clinton's campaign has, on numerous occasions, dismissed speculation over the nonprofit's internal dealings as conservative propaganda.
The high number of casualties raised speculation that the ship had been overcrowded and possibly did not have enough safety equipment for everyone on board.
Speculation about her involvement has been rife since the scandal was revealed following the shooting of budget director Paul Mphwiyo in September.
It took the unusual step of confirming the private medical visit following the flurry of speculation on social media about her health.
Everyone in the Labor party suspected he had no intention of serving much more than six weeks of a new Senate term, and even before the election, speculation began about who would replace him.
Pirlo, who did not even make it off the bench on Sunday, has not made the brightest of starts but the speculation that he might not extend his contract past the end of this year is likely overblown.
And most of it remains just that – speculation, albeit of a kind that has fuelled character assassinations from those circling the wagons around the intelligence agencies.
Snowden emphatically denied speculation that he had cut a deal with the Chinese government, giving them classified documents in exchange for providing him with an eventual safe haven.
Positive US economic news, and this week's signs of agreement over the country's budget, have prompted increasing speculation the Fed might trim its $85bn a month bond buying programme.
