This remind me of back in early November; it was just before the election, and a visiting celebrant, during his homily, said that he cannot fathom a Catholic voting for the Democratic party. I felt uncomfortable during the homily, and after the homily was ended, the congregation applauded; because of how I felt, I did not applaud. I felt it breached from the spirituality and beautiful words that usually are said during the homily by my home priest. I did not feel comfortable discussing politics in church, and I was surprised it was brought up.
As for the OP, I would agree with the other posters. If you do not agree with what is said, you may either remain silent, or (as mentioned above me) say “Thy Will be done, O Lord” instead of “Lord, hear our prayer.” Remember, the Lord knows your heart, and He will understand.
And, to beat a dead horse, I don’t see the problem with “Obamacare.” It helps people get their medication as well as the elderly. I see that as a good thing.