Meredith Viera is liberal too - Rosie may be a more loud and strident advocate, but I'd bet her politics aren't any farther to the left of Meredith's.
I don't always agree with what Rosie says, but she does donate over 50% of her income to children's charities, so I am happy to see her earning even more money to give away.
Elisabeth will likely find herself drowned out of most discussions, but frankly I think the rest of the cast (Barbara included) dislikes Elisabeth anyway, and her days are numbered, with or without Rosie.