Leading progressives are pressuring President-elect Joe Biden to embrace their policy agenda even as more centrist Democrats argue such proposals prevented the party from retaking full control of Congress. For now, much of the lobbying centers on who Biden should — or should not — appoint to key posts as he builds out the administration that will take office in January. The left-leaning think tank Progressive Change Institute partnered with more than 40 activist groups and on Friday released a detailed list of 400 progressive policy experts they want Biden to bring on.