Who is the longest-serving senator?
Robert Byrd
Robert Byrd
Robert Byrd
Chuck Grassley
Robert Byrd
Chuck Grassley
Robert Byrd
Joe Biden
Chuck Grassley
Robert Byrd
Strom Thurmond
Joe Biden
Bob Dole
Chuck Grassley
Robert Byrd
Strom Thurmond
Ted Kennedy
Tom Daschle
Joe Biden
Bob Dole
John McCain
Chuck Grassley
Robert Byrd
Strom Thurmond
Ted Kennedy
Joe Biden
Bob Dole
Tom Daschle
John McCain
Ted Kennedy
Strom Thurmond
Robert Byrd
Chuck Grassley
John Dingell
Joe Biden
Bob Dole
John McCain
Ted Kennedy
Frank Lautenberg
Tom Daschle
Strom Thurmond
Ted Stevens
Robert Byrd
John Dingell
Joe Biden
John McCain
Charles Schumer
Bob Dole
Ted Kennedy
Frank Lautenberg
Harry Reid
Strom Thurmond
Joseph Lieberman
John Kerry
Joe Biden
John McCain
Robert Byrd
Charles Schumer
Bob Dole
John Dingell
Tom Daschle
Ted Kennedy
Ted Stevens
Harry Reid
Frank Lautenberg
Strom Thurmond
Edward M. Kennedy
John Kerry
John Dingell Jr.
John McCain
Joe Biden
Robert Byrd
Ted Kennedy
Charles Schumer
Bob Dole
Tom Daschle
Harry Reid
Joseph Lieberman
Ted Stevens
Frank Lautenberg
John Dingell
Strom Thurmond
John Kerry
John McCain, Jr.
John McCain
Edward M. Kennedy
Joe Biden
Ted Kennedy
Charles Schumer
Harry Reid
Bob Dole
Tom Daschle
Bernie Sanders
Robert Byrd
Ted Kennedy, Jr.
John Kerry
Strom Thurmond
Hillary Clinton
John McCain
Tom Coburn
John Dingell
Ted Kennedy
Joe Biden
Ted Stevens
Harry Reid
Tom Harkin
Charles Schumer
Joseph Lieberman
Bob Dole
Richard Lugar
Bernie Sanders
John Dingell Jr.
Tom Daschle
John Kerry
Robert Byrd
Hillary Clinton
John McCain
Strom Thurmond
Ted Kennedy
Rand Paul
Harry Reid
Joe Biden
Tom Coburn
Bernie Sanders
Tom Harkin
Charles Schumer
Bob Dole
John Dingell
Richard Lugar
John Kerry
Edward M. Kennedy
Hillary Clinton
John McCain
Robert Byrd
Strom Thurmond
John McCain, Jr.
Ted Kennedy
Rand Paul
Joseph Lieberman
Harry Reid
Joe Biden
Bernie Sanders
Tom Coburn
Tom Harkin
Charles Schumer
Bob Dole
John Kerry
Hillary Clinton
John McCain
Ted Kennedy, Jr.
Bob Casey
Ted Kennedy
Strom Thurmond
Harry Reid
Robert Byrd III
Bernie Sanders
Robert Byrd
Edward M. Kennedy
Joe Biden
John Kerry
Bob Dole
John McCain
Joseph Lieberman
Ted Kennedy
Harry Reid
Strom Thurmond
John Dingell Jr.
Robert Byrd III
Joe Biden
Robert Byrd
John Kerry
John McCain
Bob Dole
John McCain, Jr.
Ted Kennedy
Harry Reid
Tom Daschle.
Robert Byrd II
John Kerry
Joe Biden
John McCain
Ted Kennedy, Jr.
Robert Byrd III
Ted Kennedy
Robert Byrd
Harry Reid
John Kerry
Strom Thurmond.
John McCain
Robert Byrd II
Joe Biden
Ted Kennedy
Bob Dole
Robert Byrd III
Robert Byrd
Robert Byrne
Richard Nixon
Tom Daschle.
John Dingell Jr.
John McCain
Strom Thurmond.