David Frum's analysis of Obama's Biden pick is worth your time. Frum writes: "If Obama had felt confident, he would have picked Tim Kaine. Now, though, a month of bad polls have taken their toll, and Obama is acting defensively and protectively." Frum makes several good points, but the one that resonates the most is this: The line on Biden is that his roots in Scranton, Pennsylvania, will help Obama connect with the fabled "working-class whites" who so far are not supporting the Illinois senator. Frum points out that Obama, as the head of a party that has won Pennsylvania in the last four presidential elections, shouldn't be worried about the Keystone State at all. And yet it seems he is. By picking Kaine or Bayh, Obama would've been attempting to expand the geographical reach of the Democratic party. He didn't do that, though. Which suggests the Obama campaign may be worried about Obama's appeal in places normally open to Democratic presidential candidates.