Beyond party affiliation, there are some lesser-known loyalties tied to lawmakers in Washington, DC.
Greek life fraternities and sororities, which often dominate social life in colleges and universities across the US, also have some of the strongest footprints in the Capitol.
In the 119th Congress, just under a third of US senators are affiliated with a Greek organization, according to the Fraternity and Sorority Political Action Committee, which aims to "help more Greek alumnae get elected to the House or Senate for the first time."
In years with congressional races throughout the country, the political action committee — often nicknamed the "Frat PAC" — can play a significant financial role. In the 2023-24 election cycle, the PAC raised over $900,000. Today, it has raised over $650,000 for the 2025-26 cycle, toward a $1 million goal.
While funding goes toward the campaigns of Greek-life alumns, the committee does not align with one party over the other. FSPAC said that in the 2023-24 cycle, 52% of funds went to Republican candidates and 48% to Democratic candidates out of the 97 congressional campaigns it donated to.
Beyond nationally organized fundraising, Greek life organizations also offer their lifelong members access to a network of powerful connections in the Capitol and beyond.
See the 32 Greek-life-affiliated senators sitting in Congress, as listed by FSPAC.
Jim Banks
State: Indiana
Party: Republican
Organization: Delta Chi
John Barrasso
State: Wyoming
Party: Republican
Organization: Phi Kappa Tau
Michael Bennet
State: Colorado
Party: Democratic
Organization: Beta Theta Pi
Marsha Blackburn
State: Tennessee
Party: Republican
Organization: Chi Omega
Lisa Blunt Rochester
State: Delaware
Party: Democratic
Organization: Alpha Kappa Alpha
Katie Britt
State: Alabama
Party: Republican
Organization: Chi Omega
Shelley Moore Capito
State: West Virginia
Party: Republican
Organization: Kappa Kappa Gamma
Chris Coons
State: Delaware
Party: Democratic
Organization: Delta Kappa Epsilon
John Cornyn
State: Texas
Party: Republican
Organization: Local (non-national) Chi Delta Tau chapter at Trinity College
Steve Daines
State: Montana
Party: Republican
Organization: Sigma Nu
Deb Fischer
State: Nebraska
Party: Republican
Organization: Gamma Phi Beta
Ruben Gallego
State: Arizona
Party: Democratic
Organization: Sigma Chi
Kirsten Gillibrand
State: New York
Party: Democratic
Organization: Kappa Kappa Gamma
Chuck Grassley
State: Iowa
Party: Republican
Organization: Alpha Gamma Rho
Bill Hagerty
State: Tennessee
Party: Republican
Organization: Sigma Alpha Epsilon
John Hoeven
State: North Dakota
Party: Republican
Organization: Local (non-national) Alpha Chi Alpha fraternity at Dartmouth College
John Kennedy
State: Louisiana
Party: Republican
Organization: Sigma Nu
Angus King
State: Maine
Party: Independent
Organization: Delta Upsilon
Roger Marshall
State: Kansas
Party: Republican
Organization: Beta Theta Pi
Mitch McConnell
State: Kentucky
Party: Republican
Organization: Phi Kappa Tau
Ashley Moody
State: Florida
Party: Republican
Organization: Alpha Delta Pi
Jerry Moran
State: Kansas
Party: Republican
Organization: Alpha Tau Omega
Lisa Murkowski
State: Alaska
Party: Republican
Organization: Pi Beta Phi
Alex Padilla
State: California
Party: Democratic
Organization: Zeta Psi
Gary Peters
State: Michigan
Party: Democratic
Organization: Local (non-national) Zeta Sigma fraternity at Alma College.
Jim Risch
State: Idaho
Party: Republican
Organization: Phi Delta Theta
Brian Schatz
State: Hawaii
Party: Democratic
Organization: Local (non-national) Phi Delta fraternity at Pomona College
Eric Schmitt
State: Missouri
Party: Republican
Organization: Alpha Kappa Lambda
Dan Sullivan
State: Alaska
Party: Republican
Organization: Private club
Raphael Warnock
State: Georgia
Party: Democratic
Organization: Alpha Phi Alpha
Elizabeth Warren
State: Massachusetts
Party: Democratic
Organization: Kappa Alpha Theta
Roger Wicker
State: Mississippi
Party: Republican
Organization: Sigma Nu
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Kristine Villarroel is a reporter on Business Insider's Editorial Partnerships team.Her reporting often turns data into accessible stories about how money, education, policy, and place shape Americans’ lives. She covers stories on college costs and degree outcomes, state-by-state comparisons, public officials’ salaries, the rising cost of living, travel, food, and real estate.She has previously worked writing about culture, entertainment, music, and tech. Her work has been featured on Teen Vogue and Wired. She graduated from the University of Florida with a degree in journalism. There, she worked as editor of The Independent Florida Alligator. Email Villarroel at kvillarroel@insider.com and follow her on X @ktnedelvalle