Exactly 2.
Yes, it is one of the requirements. If a senator does not live in the state they represent, then they cannot become a senator.
2
YES. He served one term as US senator from NY. He was also a state senator at one time/
2
Two per state.
Hillary Clinton, secretary of state, is an ex-senator. I think she is the only one. A senator has to resign before serving on the cabinet.
Ted Kennedy
Kentucky has 38 State Senators.
Senator Ted Kennedy (Died on 25 August 2009). Succeeded by Paul G. Kirk, Jr. The special election then elected Scott P. Brown to fill that seat. He will be seated in February 2010. Schumer and Gillibrand of New York.
2 years
Barbara boxer
Because every senator is senator for the same senate, no matter what state, their term is always two years.