evidence: In the ensuing months Biden outlined a platform that included a number of policies that appealed to progressives. He notably supported government aid to low-income communities, ambitious climate-change legislation, affordable child care, and the expansion of federal health insurance plans, such as the Patient Protection and Affordable Care Act, which had been enacted during Obama’s presidency. During this time Biden gained a somewhat sizable lead over Trump in nationwide polls, in part due to criticism of the president’s response to the COVID-19 pandemic, which had caused an economic downturn that rivaled the Great Depression. In August 2020 Biden chose Kamala Harris as his running mate—she became the first African American woman to appear on a major party’s national ticket—and later that month, he officially was named the Democratic presidential nominee. Although preelection polling had shown Biden with a significant lead in key battleground states, the actual contest proved to be much closer. Nevertheless, Biden and Harris succeeded in rebuilding the so-called "Blue Wall" through the Midwestern Rust Belt states, and on November 7, four days after the election, Biden secured the 270 electoral votes necessary to capture the presidency.