Final answer:
Laura Nader focuses on politics and law in social control, while Ralph Nader is prominent in environmental activism and social justice. Ralph's political activism became especially notable during the 2000 election where he influenced the Democratic vote. Both Naders have impacted political discourse, albeit in different areas.
Step-by-step explanation:
The question focuses on the political causes that two individuals named 'Nadar' have been involved with. Since two figures are mentioned within the context, we can distinguish between them: Laura Nader, who is notable for her work in the area of anthropology, with interests in politics and law, and her brother Ralph Nader, a well-known consumer advocate and political figure.
Laura Nader's work has mainly focused on how legal-political systems operate as a form of social control. However, Ralph Nader is more publicly known for his political activism, running for president as the Green Party candidate in the 2000 election and later as an independent in 2008, reflecting his environmental activism and commitment to social justice.
Ralph Nader's 2000 presidential campaign was significant politically because he won votes from many Democrats, a factor some analysts claim impacted the outcome of the election. Nader's key focuses have been on promoting environmental issues, consumer rights, and reducing corporate influence in American politics. His advocacy for these causes continues to influence the political discourse in the United States.