When Trump defeated Clinton in 2016, the initial Democrat response was to say the party needed to reconnect with the white working class, the Mid-Western voters who defected to the Republicans. Not any more. Now Democrats are looking for a candidate who can turn Trump’s rhetoric, notably on race and gender, back on the White House. A candidate who will provoke Trump into an act of self-annihilation. On Monday, Senator Kamala Harris of California announced her candidacy — joining her fellow Senators Kirsten Gillibrand and Elizabeth Warren, Congresswoman Tulsi Gabbard of Hawaii, and the two longshot men in the race: Julian Castro, a former mayor of San Antonio, Texas, and housing secretary under President Obama, and Richard Ojeda, a military veteran from West Virginia.