We're 5 days into the "bitter cling" scandal and the numbers in Pennsylvania have barely moved. With seven days until the vote, Clinton is still ahead of Obama, but only by 6.7%. That puts her in a bit of a spot tonight. Does Clinton try and drive home the attack that he's an out of touch elitist and risk an embarrassing repeat of the jeers she received from a crowd earlier this week? Can she afford not to take that risk?

The problem for Senator Clinton, as has been the case so often in the past, is that her own shortcomings and baggage have effectively blunted any angle of attack against Obama. On fundraising ethics, Rezko, experience or anything else, her attacks have almost always fallen short or gained little traction against Obama because she was vulnerable to those same charges herself.

There's an element of this to the elitist charge. Working class voters have been a core constituency of hers throughout the primary campaign, despite the fact Clinton is about as far from blue collar as can be. But, to her credit and in contrast to Obama, she hasn't been caught patronizing or being condescending to these voters.

But there's another angle that Clinton should attack. It does seem to be true that there is a sense of unease about Obama bubbling among some Democrats, even some of his supporters admit to nagging doubts about the various stories that have dotted the landscape over the last few weeks.

Clinton may be better served by focusing less on a contrast that doesn't seem to be gaining traction (Obama is an elitist and I'm not) and more on trying to exploit Democrats' anxieties about Obama to her advantage (Obama is not who he says he is)

From the beginning, Clinton has been hurt by high negatives and the fact that everyone knows who she is and most already have fixed opinions about her. Again, however, this can be used to her advantage to draw the contrast she wants with Obama. Even at this late stage, and despite the fact Obama now has very high name recognition among Democrats, voters don't really "know" Obama in the same way they do Clinton.

So instead of taking the stage tonight and launching a full frontal assault on Obama for being an elitist, Clinton should shift gears and subtly put the proposition before Pennsylvania voters: it seems almost every day we're learning something new and different about Barack Obama. Is he really who he says he is?