What you mean is will he publicly denounce them as excommunicated, and force his priests to withhold communion so as to not desecrate the body of Christ, or permit sinners to drink poison unto themselves.
Biden, Pelosi, et al, are already excommunicated, and they are well aware of that fact; the scandal is that they continue to portray themselves as Catholics.
Pope Francis wrote a document as president of the Latin American episcopal conference, approved by Pope Benedict, calling on all the bishops of Latin America to publicly proclaim the excommunication of politicians who supported abortion. He has famously denounced the social radicals running Argentina, Christina Kirchner and her now-departed husband, Nestor (Ernesto).
Public excommunication is an act of a local bishop. Benedict demanded it. When Cardinal Wuerl failed to transmit those demands to the rest of the American bishops, Benedict promoted the bishop who most vocally denounced pro-abortion Catholics receiving communion, the bishop of St. Louis, Cardinal Burke, to be head of the Catholic Supreme Court. He also gave huge promotions to any other bishops who followed suit. But Benedict did a poor job of media relations with America, and his actions have not been made clear to Americans. I hope Pope Francis finds a way to be more forceful.
But just so you know, church-going Catholics voted 67% for Romney; nominal Catholics voted only 23% for Romney, so among those who can be reached, most are being reached. (Church-going white evangelicals voted 78% for Romney, but thats not much different from non-church going white evangelicals.) The ones who arent being reached are the Hispanics, who dont go to church and vote pretty much like black protestants. I hope Pope Francis is much better able to reach them.
Are these baby murderers receiving communion?
If not, then they don't believe in communion in the first place ergo, they are not Catholics.
If the pope is really pro-life, he needs to really communicate from the chair that no pro-death Catholic is Catholic. Mother Teresa communicated that very effectively. Why can't he?