There is no reason, political or practical, to filibuster a vote on Supreme Court nominee Elena Kagan. Rejecting the filibuster of Kagan is not only a smart move politically, but it is the Constitutionally appropriate move. The GOP would be well warned to conduct the appropriate hearings (although that in itself is a political Kabuki of lesser importance with Kagan given the dearth of public writings by Kagan), schedule the vote and then vote. If the Democrats have enough votes to approve her nomination--and they should--then why get in the way.
There is already too much polarization and politicalization of issues, why make a more or less foregone conclusion a sacrificial lamb for the GOP's supposed adherence to constitutional principles.