Robert Royce (R-PA) is the senior Senator from Pennsylvania and U.S. Senate Majority Leader. He succeeded Jack Moseley to that position in 2003. In Bartlet's first term, he was a moderate Pennsylvania Member of Congress, who helped to prevent a veto override by Republicans to repeal the Estate ("Death") Tax, expressing his concern that the GOP had abandoned the "sensible center."
Later as Senate Majority Leader, he participated in the vetting process for the Vice President of the United States after the resignation of John Hoynes and expressed approval for U.S. Rep. Bob Russell (D-CO) for the position after the Colorado congressman's name was pushed into consideration by Speaker Haffley.
Royce was briefly considered - and lobbied heavily - for the vice presidential nomination under U.S. Sen. Arnold Vinick (R-CA) in 2006, but was not selected. He later discussed with Sheila Brooks the possibility of running for President in 2010 although he was realistic about his chances of winning the nomination.