Congressional bipartisanship is more common on foreign policy than on domestic policy. Why is that so, and does cooperation on international issues offer any broader lessons for fostering bipartisanship? In a book project in process, I show how the interest group and ideological landscape associated with issues contributes to three distinct forms of bipartisanship on foreign policy. Funding from SSRC would allow me to complete the writing of this book and extend its impact by writing a journal article analyzing the ability of non-governmental organizations to generate congressional bipartisanship by forming ideologically diverse advocacy coalitions.