Two years after George Floyd’s murder by a Minneapolis police officer, the nation is struggling to deliver progress on a host of issues critical to race, policing and inequality in American life. Floyd’s killing reverberated throughout the country, leading to protests for change not only in how police in the nation operate, but on a range of other issues including voting rights and representation. But efforts in Washington to enact police or voting rights reform have run aground amid deep differences between Republicans and Democrats. Just more than a week ago, a lone gunman in Buffalo, N.Y., killed 10 people...