The electoral college
none The voting public of each US congressional district elects one US Representative, and the voting public of each US state elects two US Senators.
The people
Senate i think
The citizens of the United States.
Electoral college
Oklahoma! =]
Their constituants. (the people in the state they are from that vote for them)
Each state elects 2 US senators
The electoral college
all american citizans over the age of 18
The members of the US House of Representatives elect the Speaker of the House.
The current president seemed to not need anyone else.