A bunch of new listings from Idealist

I highly recommend the Pew Environment Group, Forest Trends, the Government Accountability Project, and the Freedom House

There are many other great options below. Good luck on these!

Communications Intern at the Pew Environment Group
Pew Environment Group
http://www.idealist.org/en/internship/126181-15
Washington, District of Columbia, United States

Carbon Markets Intern
Forest Trends
http://www.idealist.org/en/internship/126223-58
Washington, District of Columbia, United States

Fundraising and Development Internship
Government Accountability Project
http://www.idealist.org/en/internship/126191-318
Washington, District of Columbia, United States

Development Assistant (Internship)
World Security Institute
http://www.idealist.org/en/internship/126235-95
Washington, District of Columbia, United States

ISC Intern
International Student Conferences
http://www.idealist.org/en/internship/126173-111
Washington, District of Columbia, United States

Development Office Intern
LULAC National Educational Service Centers
http://www.idealist.org/en/internship/126218-255
washington, District of Columbia, United States

Public Health Internship
Government Accountability Project
http://www.idealist.org/en/internship/126208-185
Washington, District of Columbia, United States

Energy & Climate Policy Program: Advanced Internship
Environmental and Energy Study Institute
http://www.idealist.org/en/internship/126176-211
Washington, District of Columbia, United States

Lung Cancer Roundtable Intern
American Lung Association
http://www.idealist.org/en/internship/126196-151
Washington, District of Columbia, United States

Environmental Internship
Government Accountability Project
http://www.idealist.org/en/internship/126210-321
Washington, District of Columbia, United States

Internships
DC Prep
http://www.idealist.org/en/internship/126180-314
Washington, District of Columbia, United States

Technical Design Internship
National Women's Health Network
http://www.idealist.org/en/internship/126212-55
Washington, District of Columbia, United States

Federal Fiscal Policy Internship
OMB Watch
http://www.idealist.org/en/internship/126186-181
Washington, District of Columbia, United States

Intern (Africa)
Freedom House
http://www.idealist.org/en/internship/126213-88
Washington, District of Columbia, United States

Research Assistant - Terrorism Project
World Security Institute
http://www.idealist.org/en/internship/126236-128
Washington, District of Columbia, United States

Marketing Communications Intern
TechnoServe
http://www.idealist.org/en/internship/126204-52
Washington, District of Columbia, United States

Research Intern
Microcredit Summit Campaign, The
http://www.idealist.org/en/internship/126172-78
Washington, District of Columbia, United States

Fall Internship
Hunt Alternatives
http://www.idealist.org/en/internship/126225-125
Washington, District of Columbia, United States

Winter Intern Associate- Policy and Economics
The Public Forum Institute
http://www.idealist.org/en/internship/126233-28
Washington, District of Columbia, United States