As digital firms gain greater influence over public affairs budgets, holding companies are identifying digital shops to both acquire and partner with in order to better control competition and provide stronger client service.

WPP said in December it would acquire Blue State Digital, a well-known digital shop often recognized for its work with Obama for America in 2008. WPP-owned Burson-Marsteller announced in January it had developed a strategic partnership with Targeted Victory, a digital shop founded by ...