"While one has a clear and grave obligation to vote against legislation that bolsters abortion, the view of refusing Communion to politicians who support keeping abortion legal is not part of the pastoral tradition of the Church."
Pastoral decisions cannot be applied without an understanding of those to whom you are the pastor. And therefore, I certainly would believe this is something best left to the decision of the individual bishop.
That does not mean that anyone has to agree with him, or that no one should try to persuade him to change a pastoral direction. They just have to recognize that this is an area left to his own authority. And that lax disciplinarians can still be very orthodox bishops.
This is fundamentally different from those clerics who refuse to teach the faith, and scandalize the faithful.
I think many Bishops are against the idea of withholding Communion from the pro-abortion politicians because they don't want the politicians to have any reason to be a martyr in the eyes of the uninformed faithful. This whole situation shows just how much education about Church teaching is needed, even on the part of some priests who are still clinging to the Seamless Garment idea because that is what gave the pro-abortion Democrats cover in the late 80s and 90s