KNOWN abortion supporters maybe...but the logistical impossibility of determining who exactly IS a supporter and who is NOT a supporter kinda' makes this concept hard to implement, however laudable the ends...
The stance of Catholic politicans, like all other politicians, on every issue, is public knowledge. The Catholic hierarchy is not blimd to their public opinions.
Therefore, if John Kerry or Rudy Giulani join with others in the congregation to receive Communion, and they are recognized, where does the pastor, the officiating priest, or an extraordinary minister receive the authority to "aid and abet" the commission of what the Church says is a serious sin?