After the 2016 election, Americans formed thousands of anti-Trump grassroots resistance groups across the country. This chapter draws from in-depth interviews and other evidence to explore the electoral activities and impact of such groups in six pivotal Pennsylvania swing counties around Philadelphia and Lehigh Valley. Formed in suburban and rural areas without historically strong Democratic Parties, these resistance groups revitalized local Democratic Party organizations and elected like-minded candidates to political office. Their members registered new Democratic voters and recruited, trained, and deployed volunteers to canvass door-to-door during crucial campaign moments. These groups, predominantly led by women, also supported many women candidates at both the federal and state level. Despite their broad support of Democratic candidates, resistance groups retained varying degrees of independence from party organizations and navigated occasional friction with incumbent party leadership. Resistance efforts helped Pennsylvania Democrats in 2018 and improved their future prospects, though questions remain about the extent to which they will remain independent of the Democratic Party in 2020 and beyond.