One thing to consider is whether his interest in the computational side of things really means that he should pursue a full-blown CS degree, which could be rough if he has math challenges. There are some great programs that blend data analytics with social sciences, and produce graduates with great marketable computational skills, but without such a deep theoretical dive into the mathematical “guts” of programming. Denison’s Data Analytics major is a good example: Data Analytics | Denison University , and poli sci is strong there. IU has been mentioned, and their Policy Analysis major could be worth looking at Major in Policy Analysis: Degrees & Majors: Undergraduate: Paul H. O’Neill School of Public and Environmental Affairs: Indiana University Bloomington Penn State has its Social Data Analytics program https://soda.la.psu.edu/ and Ohio State has a strong Data Analytics major with a choice of emphases https://data-analytics.osu.edu/ But since you’re interested in smaller schools, Denison was the one that really sprang to mind.
Europe-wise, SLU Madrid could be worth a look. They have a computer science BA that can be combined with poli sci, and you can get a US degree, either by spending 4 years in Madrid or via a 2+2 plan in Madrid and St Louis.