While some scientists are planning to march on Washington this Saturday for Earth Day, others are pursuing a different kind of political activism - running for office. Mostly aligned with the Democratic Party, these scientists are motivated by what they consider a hostile stance toward science and research taken by the Trump administration and a Republican-led Congress. The campaign's scientists are mulling address climate change, environmental protection, technology, education and jobs. On Saturday, NewsHour Weekend Correspondent Megan Thompson reports on their growing numbers.