the first ten democrats take the stage to face off tonight. plus, the search for answers after the gilroy shooting. what investigators know about the alleged gunman. new details on two american teens arrested in italy. detectives trace the knife they say was used to kill a police officer. plus, capital one hacked. 100 million credit card applications and accounts compromised in one of the biggest data breaches ever. welcome back to "early start." i'm boris sanchez in for dave briggs. >> i'm christine romance. nice to see you. 31 minutes past the hour this tuesday morning. it's just hours to go until the start of cnn's debates. clashes among two fields of ten presidential candidates. each clashes that could reshape the democratic race. on the eve of the debates, joe biden is bouncing back to 34%, roughly his share before the first debate. biden has done it almost entirely at the expense of kamala harris, who pulled to a statistical tie with the former vice president after the early debate. president trump injecting race