My reading is that they should not recieve Communion.
Canon 752 While the assent of faith is not required, a religious submission of intellect and will is to be given to any doctrine which either the Supreme Pontiff or the College of Bishops, exercising their authentic magisterium, declare upon a matter of faith or morals, even though they do not intend to proclaim that doctrine by definitive act. Christ’s faithful are therefore to ensure that they avoid whatever does not accord with that doctrine.
Given such unanimity in the doctrinal and disciplinary tradition of the Church, Pope Paul VI was able to declare that this tradition [regarding abortion] is unchanged and unchangeable. Therefore, by the authority which Christ conferred upon Peter and his Successors, in communion with the Bishops – who on various occasions have condemned abortion and who in the aforementioned consultation, albeit dispersed throughout the world, have shown unanimous agreement concerning this doctrine – I declare that direct abortion, that is, abortion willed as an end or as a means, always constitutes a grave moral disorder, since it is the deliberate killing of an innocent human being. This doctrine is based upon the natural law and upon the written Word of God, is transmitted by the Church’s Tradition and taught by the ordinary and universal Magisterium. (Evangelium Vitae, § 62)
Canon 915 Those upon whom the penalty of excommunication or interdict has been imposed or declared, and others who obstinately persist in manifest grave sin, are not to be admitted to holy communion.
Support for abortion is a grave sin. The science is clear cut: conception = life.
Canon 1364 §1 An apostate from the faith, a heretic or a schismatic incurs a latae sententiae excommunication, without prejudice to the provision of Canon 194 §1, n. 2; a cleric, moreover, may be punished with the penalties mentioned in Canon 1336 §1, nn. 1, 2 and 3.
The Church’s opposition to abortion is infallible and a divinely revealed truth. Thus those Catholics who support abortion, aren’t they denying a divine truth and thus as the Church is clear in her position, does that not make them heretics.
Canon 751 Heresy is the obstinate denial or doubt, after baptism, of a truth which must be believed by divine and Catholic faith.