Who is the fourth longest serving senator?
Edward M. Kennedy
Robert Byrd
Robert Byrd
Chuck Grassley
Robert Byrd
Chuck Grassley
Robert Byrd
Chuck Grassley
Joe Biden
Robert Byrd
Chuck Grassley
Strom Thurmond
Joe Biden
Robert Byrd
Bob Dole
Chuck Grassley
Daniel Inouye
Jim DeMint
Joseph Lieberman
Strom Thurmond
Ted Stevens
Joe Biden
Edward M. Kennedy
Robert Byrd
Bob Dole
Chuck Grassley
Ted Kennedy
Strom Thurmond
Tom Daschle
Ted Stevens
Barbara Mikulski
Joe Biden
Joseph Biden
Frank Lautenberg
Bob Dole
Jesse Helms
Robert Byrd
Edward M. Kennedy
Ted Kennedy
John McCain
John Dingell
Strom Thurmond
Ted Stevens
Tom Daschle
Joe Biden
Barbara Mikulski
Frank Lautenberg
Barbara Boxer
Bob Dole
Ted Kennedy
John McCain
John Dingell Jr.
Robert Byrd
Bob Casey
Bob Casey Jr.
Joseph Lieberman
John Dingell
Mike Mansfield
Edward M. Kennedy
Strom Thurmond
Ted Stevens
Tom Daschle
Joe Biden
Charles Schumer
Frank Lautenberg
Barbara Boxer
Bob Dole
Ted Kennedy
John McCain
Harry Reid
John Dingell
Robert Byrd
Mike Mansfield
Strom Thurmond
Ted Stevens
Joe Biden
Charles Schumer
John Kerry
Tom Daschle
Ted Kennedy
Frank Lautenberg
Joseph Lieberman
Bob Dole
John McCain
Harry Reid
John McCain, Jr.
Bob Casey
John Dingell
Edward M. Kennedy
Mike Mansfield
Strom Thurmond
John Dingell Jr.
Ted Stevens
Robert Byrd
John Kerry
Tom Harkin
Ted Kennedy
Joe Biden
Charles Schumer
John McCain
Ted Kennedy, Jr.
Harry Reid
Frank Lautenberg
Bob Dole
Bill Frist
Richard Lugar
Tom Coburn
Joseph Lieberman
John Kerry
Strom Thurmond
Ted Kennedy
Ted Stevens
Tom Harkin
John McCain
Robert Byrd
Joe Biden
Harry Reid
Charles Schumer
Bob Dole
Edward M. Kennedy
Bernie Sanders
Hillary Clinton
Richard Lugar
John Dingell
Tom Coburn
John Kerry
Ted Kennedy
John McCain
Harry Reid
Tom Harkin
Rand Paul
Joe Biden
Charles Schumer
John Dingell Jr.
John McCain, Jr.
Bernie Sanders
Bob Dole
Bob Casey
Ted Stevens
Robert Byrd
Edward M. Kennedy
Richard Lugar
John Kerry
Tom Coburn
Joseph Lieberman
Ted Kennedy
John McCain
Ted Kennedy, Jr.
Harry Reid
Tom Harkin
Joe Biden
Robert Byrd III
Charles Schumer
Robert Byrd
John Kerry
Bob Dole
Ted Kennedy
John McCain
Harry Reid
Bob Casey
John Dingell
Joe Biden
John Dingell Jr.
Robert Byrd III
Joseph Lieberman
John Kerry
Ted Kennedy
Robert Byrd
John McCain
Harry Reid
Bill Bradley
John McCain, Jr.
Robert Byrd II
Bob Casey Jr.
Joe Biden
Bob Dole
John Kerry
Ted Kennedy
John McCain
Ted Kennedy, Jr.
Harry Reid
Robert Byrd III
Robert Byrd
Joe Biden
Joseph Lieberman
John Kerry
Bob Dole
Robert Byrd II
J. Edward Kennedy
Ted Kennedy
John McCain
Robert Byrd III
Robert Byrd
Joe Biden
Ted Kennedy
John McCain
Edward M. Kennedy III
Robert Byrd II
Strom Thurmond.
Robert Byrne
Robert Byrd III