Hm! I guess I’m in the minority. The root cause of much of American anti-Catholicism in years past was the position of the Vatican that there should not be separation of church and state. Protestants from Europe this fear with them. The “Syllabus of Errors” by Pope Pius IX (1870?) was very specific about that, and this was used for generations to stir up suspicion of the Catholic Church among Americans.
John F. Kennedy put this fear to rest in 1960, but it is not far beneath the surface, and any perceived attempt by a Pope to intefere in US politics is dangerous. It could not only rekindle anxiety about Catholicism among Protestants, Jews and others but alienate many Catholics as well. If the Pope declares that the Eucharist is to be denied to Catholic politicians who are pro-choice that would mean turning away many, probably the majority, of Catholic members of Congress. Just imagine what the consequences would be. It seems to me that every Catholic candidate for president, Republican (Giuliani) or Democrat (Biden, Dodd, Kucinich, etc) support choice - though they claim to be anti-abortion on a personal level.