This latest result from Pennsylvania ought to put a damper on any Rendell VP speculation, since according to this poll putting Rendell on the ticket would be a net loser of votes for Obama, while adding Clinton allows the ticket to break even.  Ridge adds nothing on the Republican side, which probably should be the final nail in the coffin of that terrible idea.  More sobering for the Obama camp has to be the numbers related to concern about the candidate’s associations: 55% are very or somewhat concerned (40% are very concerned), including 44% of Democrats, 46% of independents, 59% of moderates and 35% of liberals.  The makeup of the undecided vote is worth noting: 9% of Democrats and 11% of independents remain unsure which candidate they prefer, and overall Obama has the support of just 69% of Democrats.  If I am the Democratic nominee with just a four-point lead in Pennsylvania,  I am not reassured by the fact that I have improved on my even more anemic two-point lead from a month ago.  There has been some Democratic movement toward Obama in the last month (the awful 69% figure is up from 63%), but it has been fairly small.