cycle. everybody has more time the make their arguments. i would be watching to see does anyone try to make biden down a peg? he has been the front runner the entire campaign. do buttegeig and warren mix it up on astage the way they have been doing on the campaign trail. will they take it to the stage when they are sharing the stage tonight. look at elect. . joe biden is seen by democrats by far as the one that can beat trump. that's the argument that everyone else has to try to break into in terms of biden's support on the stage tonight. >> a major and powerful argument indeed. david chalian on the scene for us in los angeles. once again to our viewers, watch tonight's pbs news hour politico democratic debate here on cnn and on our local pbs station. our coverage starts at 8:00 p.m. eastern. blac. ix them. so will we. no we won't. lac. ac. c. . -network with vsp.