According to this article, Sen. Lisa Murkowski (R) – AK, has openly stated that she regrets her vote for conscience protection regarding the HHS mandate and would not vote so again.
She stated that the best way to prevent abortion was to reduce unwanted pregnancies, which is best done through contraception according to her.
When reminded that her church, the Catholic Church, is against contraception, she openly admitted she knows and that it doesn’t matter. She also openly admitted that sometimes abortion is necessary and she doesn’t always agree with her Church or political party.
I leave it to canonists, and I am sure they will weigh in, but it seems like this is a public profession of such that could trigger a Canon 915 related denial of communion. Presuming that her Bishop has, or will, counsel the Senator and she refuses to publicly recant her pro-abortion positions, it would seem that would constitute obstinately manifesting in grave sin given her position as a member of the United States Senate.