Senate Nuclear Caucus (Co-Chair)
Senate Recycling Caucus (Co-Chair and Founding Member)
Senate Community Health Center Caucus (Founding Member)
Moderate Democrats Working Group (Co-Chair)
Senate Environmental Justice Caucus (Co-Chair and Founding Member)

Caucus Membership 

Congressional Public Service Caucus
Congressional Bicameral High-Speed & Intercity Passenger Rail Caucus
Congressional Port Security Caucus
Congressional Boating Caucus
Senate Veterans Jobs Caucus
Senate Indian Caucus
Senate Oceans Caucus
Senate Cancer Coalition
Senate National Guard Caucus
Senate Democratic Policy Committee
Air Force Caucus
Northeast-Midwest Senate Coalition
Senate Bipartisan Small Brewers Caucus 
Congressional Arthritis Caucus  
Senate Diabetes Caucus
Whistleblower Protection Caucus

Organization Leadership

Third Way (Honorary Co-Chair)
Jobs for America’s Graduates, Inc. (Honorary Board of Directors Member)
Boy Scouts of America, Delmarva Council (Advisory Board Member)

Organization Membership

New Democrat Network
Common Cause
The American Legion
The United States Junior Chamber (Jaycees)
Veterans of Foreign Wars of the U.S.
Vietnam Veterans of America