Politics: The family business

Sen. Mark Udall, D-Colo., and his cousin Sen. Tom Udall, D-N.M., attend a weekly Senate policy luncheon in Washington, D.C.

Of the 100 members of the U.S. Senate, a third of them have family ties to other members of government, including Sen. Bernie Sanders' trans-Atlantic connection:

Mark Begich, D-Alaska: Father is former U.S. Rep. Nick Begich.

Michael Bennet, D-Colorado: Father is Douglas J. Bennet, former State Department official.

Roy Blunt, R-Missouri: Son is Matt Blunt, former Missouri governor.

Sen. Roy Blunt

John Boozman, R-Arkansas: Brother is Fay Boozman, former Arkansas state senator.

Maria Cantwell, D-Washington: Father is Paul F. Cantwell, former member of Indiana state legislature and former chief of staff to U.S. Rep. Andrew Jacobs Jr.

Ben Cardin, D-Maryland: Father is Meyer Cardin, former member of Maryland House of Delegates

    Robert P. Casey Jr., D-Pennsylvania: Father is Robert P. Casey, former Pennsylvania governor.

    Susan Collins, R-Maine: Mother is Patricia R. Collins, former mayor of Caribou, Maine; father is Donald F. Collins, former mayor of Caribou, Maine and former member of both houses of the Maine legislature

    Sen. Susan Collins

    Mike Crapo, R-Idaho: Brother is Terry Crapo, former majority leader in Idaho House of Representatives

    Jeff Flake, R-Arizona: Uncle is Jake Flake, former Arizona state senator.

    Kirsten Gillibrand, D-New York: Father is Douglas Paul Rutnik, Republican Party lobbyist.

    Kay Hagan, D-North Carolina: Uncle is Lawton Chiles, former U.S. senator and former Florida governor.

    Tom Harkin, D-Iowa: Wife is Ruth Harkin, former deputy counsel for U.S. Department of Agriculture and named CEO of the Overseas Private Investment Corporation (OPIC) by former President Bill Clinton.

    Sen, Tom Harkin

    Dean Heller, R-Nevada: Son-in-law is Ed Ableser, an Arizona state senator.

    Mike Johanns, R-Nebraska: Wife is Stephanie Armitage, Nebraska state senator.

    Tim Johnson, D-South Dakota: Son is Brendan Johnson, U.S. attorney for the District of South Dakota.

    Tim Kaine: D-Virginia: Wife is Anne Holton, Virginia education secretary; father-in-law is A. Linwood Holton Jr., former Virginia governor.

    Mary Landrieu, D-Louisiana: Father is Moon Landrieu, former New Orleans mayor; brother is Mitch Landrieu, current New Orleans mayor and former lieutenant governor of Louisiana.

    New Orleans Mayor Mitch Landrieu and his sister Louisiana Sen. Mary Landrieu.

    Mike Lee, R-Utah: Father is Rex E. Lee, former U.S. solicitor general; second cousin to Sens. Mark Udall and Tom Udall and former Sen. Gordon H. Smith.

    Carl Levin, R-Michigan: Brother is Sander M. Levin, U.S. House of Representatives.

    Joe Manchin, D-West Virginia: Father and grandfather were mayors of Farmington, West Virginia; uncle is A. James Manchin, former member of West Virginia House of Delegates, former West Virginia secretary of state and former West Virginia state treasurer.

    Claire McCaskill, D-Missouri: Mother is Betty Anne McCaskill, first woman elected to city council of Columbia, Missouri.

    Mitch McConnell, R-Kentucky: Wife is Elaine Chao, former secretary of labor.

    Lisa Murkowski, R-Alaska: Father is Frank Murkowski, former Alaska governor and former U.S. senator.

    Rand Paul, R-Kentucky: Father is Ron Paul, former U.S. House Representative and former presidential candidate.

    Sen, Rand Paul

    Mark Pryor, D-Arkansas: Father is David Hampton Pryor, former U.S. senator and former Arkansas governor.

    Harry Reid, D-Nevada: Son is Rory Reid, county commissioner and chairman, former candidate for Nevada governor.

    Pat Roberts, R-Kansas: Father is C. Wesley Roberts, former chairman of the Republican National Committee.

    John D. Rockefeller IV, D-West Virginia: Father-in-law is former Sen. Charles H. Percy.

    Bernie Sanders, I-Vermont: Brother is Larry Sanders, Green Party council member on Oxfordshire County Council in England.

    Sen. Bernie Sanders

    Mark Udall, D-Colorado: Father is Mo Udall, former representative and former presidential candidate; cousin is Sen. Tom Udall; second cousin is Sen. Mike Lee, R-Utah.

    Tom Udall, D-New Mexico: Father is Stewart Udall, former secretary of the interior; cousin is Sen. Mark Udall, second cousin is Sen. Mike Lee, R-Utah.

    Sheldon Whitehouse, D-Rhode Island: Father is Charles Sheldon Whitehouse, former diplomat; grandfather is Sheldon Whitehouse, former diplomat.