Oh no, America doesn't have double standards. Benazir Bhutto, former Pakistan Prime Minister has been killed in a mirror-image of the Hariri killing. But America's reaction is certain not to mirror their reaction in 2004.

Hariri assassination:
Two-times former Prime Minister
Killed in a massive suicide bomb which killed 21 others
Opposed the ruling dictatorship
Was preparing for the election just weeks away, in which he was expected to take power
Assassination blamed on Islamists
Faced corruption charges

Bhutto assassination:
Two-times former Prime Minister
Killed in a massive suicide bomb which killed 15 others
Opposed the ruling dictatorship
Was preparing for the election just weeks away, in which she was expected to take power
Assassination blamed on Islamists
Faced corruption charges

But there are some interesting differences...

Hariri assassination:
Didn't accuse the rulers of threatening him
Never considered going into exile
UN Security Council investigation justified because of Hariri's high profile nature (as a former Prime Minister) - it is the first time the UNSC has set up an investigation into the killing of an individual
Elections went ahead as planned

Bhutto assassination:
Accused the rulers of threatening her
Came back from exile, despite threats against her from the rulers (another opposition leader, Nawaz Sharif was deported)
UN Security Council investigation not justified because of Bhutto's high profile nature (as a former Prime Minister)
Elections likely to be cancelled

(The title of this post was sarcastic in case you haven't guessed)