exchanges of the night took place between two former obama administration veterans when former housing secretary julian castro took on former vice president joe biden in response to a question about the obama administration's immigration and deportation policies. >> my problem with vice president biden, and cory pointed this out last time, every time something good about barack obama comes up, he says oh, i was there, i was there, i was there, that's me too. and every time somebody questions part of the administration we were both part of, he says well, that was the president. he wants to take credit for obama's work, but not have to answer to any questions. >> vice president biden? >> i did not say i don't -- i stand with barack obama all eight years. good, bad, and indifferent. that's where i stand. i did not say i did not stand with him. >> then when it came to the