msnbc documentary, bloodlines . i want to be able to tell the story. i want to be able to select them. all in starts right now. good evening from san francisco, i m alex wagner in for chris hayes. less than a weeks before the first democratic debate of the 2016 cycle speculation about whether vice president joe biden may still join the race is shifting into overdrive. and hillary clinton is taking pre-emptive steps to position herself against her opponent. again, she came out against the trade deal just negotiated by the obama administration and now opposed by senator bernie sander s. it is a deal that the president would have no choice but to stand behind. and clinton s position draws a new battle line if he decides to run. according to a new quinnipiac poll, clinton has reasons for concern, while she still leads in florida, ohio and pennsylvania, biden serves a lot better in matchups against the presidential candidate. she barely edges out donald trump. biden managed