Robert P. Casey, - (D - PA)
Arlen Specter, - (D - PA)
Both are men. One is a Democrat, and the other is a Republican.
Pennsylvania has two US Senators: Robert Casey and Arlen Specter.
Senators do not 'represent' a city; they represent the entire State (The Commonwealth of Pennsylvania).
US Senators are chosen by state wide elections.
Boxer and Feinstein
Many folks get confused between the STATE Senate and U.S. Senate. In the U.S. Senate there are 2 senators from each state. For Pennsylvania these two senators represent the state's interests in the federal government. Within the the Pennsylvania state government there are 50 senators who represent their respective districts in Harrisburg.
There are 2 US senators from Pennsylvania. And, they are Bob Casey,Jr. and Pat Toomey.
As of 2013, the two US senators from Pennsylvania are Bob Casey, Jr. and Pat Toomey. Each state is has 2 senators. And, the US has a total of 100 senators in the Congress.
The US Senators from Pennsylvania are Casey and Specter.
Federal meaning US means that like each state in Compliance to the US Constitution has two US Senators. No more because they have a few more acres of earth and no more because of a population change.
There are two senators for each US state.
Dick Durbin and Mark Kirk are the US Senators from Illinois in 2011.