The 2010 election serves as a bookend to one of the remarkable political periods in recent U.S. history. Amidst a profound economic crisis, Americans elected an African American to the presidency and massive Democratic majorities to Congress. Beginning in 2009, the President and Congress put forward a sweeping agenda to both address the economic crisis and enact progressive policies that liberals had been advocating for decades. Within a year and a half, they would pass health care reform and financial reform alongside a stimulus package of nearly a trillion dollars. Democrats also rescued...