NEW YORK – Sen. Elizabeth Warren has a book coming out about six key experiences and perspectives. The title should be familiar to those who have followed the Massachusetts Democrat's career: “Persist.”Henry Holt and Company announced Wednesday that “Persist,” which the publisher calls “a deeply personal book and a powerful call to action," will be released April 20. “Persist” will refer to Warren's recent bid for the Democratic presidential nomination, won by Joe Biden, but is not a campaign memoir. “I wrote ‘Persist’ because I remain as committed as ever to fighting for an America that works for everyone,” Warren, whose previous books include “A Fighting Chance” and “This Fight is Our Fight,” said in a statement. “I’ve written a dozen.