In short politicians such as Joe Biden and Nancy Pelosi are guilty of grave mortal sin. They may not receive Holy Communion.
The same strictures apply to Catholic voters whether religious or lay. Catholic voters should not vote for Barack Obama who supports partial birth abortion. To do so is a grave sin.
The Democratic Party platform supports abortion. It is at odds with Catholic teaching and the law of God. No bluff or bluster from Obama, Biden or Pelosi can obscure this fact. The so -called pro- choice position represents the culture of death.
The following outlines clearly the Catholic Church position on the Abortion issue:
When political activity comes up against moral principles that do not admit of exception, compromise or derogation, the Catholic commitment becomes more evident and laden with responsibility. In the face of fundamental and inalienable ethical demands, Christians must recognize that what is at stake is the essence of the moral law, which concerns the integral good of the human person. This is the case with laws concerning abortion and euthanasia (not to be confused with the decision to forgo extraordinary treatments, which is morally legitimate). Such laws must defend the basic right to life from conception to natural death."
CONGREGATION FOR THE DOCTRINE OF THE FAITH