Bngsing and wor with segregationist senators s on wednesdaator Elizabeth Warren who is the only candidate polling in double digits on stage held strong in the first partof the debate. Many are calling Julian Castro the breakout star of the first night. Joining me is the senior Political Writer f the San Francisco chronicle and los angeles political timesin write g us. Much anticipated two nights of debates. Were going toet into the details of those Heated Exchanges in a moment. F,first do you think the fundamental tenor of this race has changed this week . Absolutely. I think we saw some exchanges between these candidates,r cularly between Kamala Harris and joe biden that this is a pivotal momentt i race. Theres such a long time to go. We have more than 200 days until the iowa caucuses. L did thst two nights determine anything . No. Did it decide who the nomineeis going to be . No. But these exchanges,cu parrly the Heated Exchange between Kamala Harris and joe biden over race is goi to