Senator Cory Booker, the former mayor of Newark who has projected an upbeat political presence at a deeply polarized time, entered the Democratic 2020 race for president on Friday, embarking on a campaign to become the second black president in American history.
Mr. Booker, in a morning email sent to supporters, drew on the spirit of the civil rights movement as he laid out his vision for a country that will “channel our common pain back into our common purpose.”
“The history of our nation is defined by collective action; by interwoven destinies of slaves and abolitionists; of those born here and those who chose America as home; of those who took up arms to defend our country, and those who linked arms to challenge and change it,” Mr. Booker said in an accompanying video.