Ed Miliband launches Labour’s election campaign on Monday by calling on supporters to knock on four million doors. The party leader will vow to fight the Tories and Lib Dems “house by house, street by street and town by town” until polling day on May 7. In a rallying call in Manchester, he will say: “Today is day one of our general election campaign. This is nothing less than a once in a generation fight about who our country works for.” Vowing not to be intimidated by the big-spending Tories, he will add: “We will offer hope, not falsehood. We...