(Pulled from Wikipedia, the presumptive White House staff and Cabinet as of series ending)

President	Matthew Santos
Vice President	Eric Baker (nominated under the terms of the 25th Amendment)
Secretary of State	Arnold Vinick (awaiting confirmation by the Senate)
Attorney General	Oliver Babish (awaiting confirmation by the Senate)
Ambassador to the United Nations	Nancy McNally (awaiting confirmation by the Senate)
Chief of Staff	Josh Lyman
Deputy Chief of Staff	Sam Seaborn
Communications Director	Louise Thornton
White House Counsel	Ainsley Hayes
Director of Legislative Affairs	Amy Gardner
Presidential Secretary	Ronna Beckman
Presidential Assistant	Bram Howard
Chief of Staff to the First Lady	Donna Moss
Press Secretary to the First Lady	Annabeth Schott

I could have lived through one more season, if only to watch Josh and Amy arguing again.