I believe Faith Hill was confirmed as an Obama donor.
I remember PETA one year declared Carrie Underwood to be the "sexiest vegetarian" or something like that, so I'd be quite surprised if she's a Republican.
But as for the poll I really can not care.
Seventh day Adventists are heavily republican, so I wouldn't say its that unusual to be republican and vegetarian. of Course Carrie Underwood isn't Adventist, but personal food choices hardly make ones politics.People who are into animal rights in that sense though rarely are overall conservative or Republican. For the record I'd be surprised if even half of Seventh Day Adventists are true strict vegetarians, just like how many members of churches that encourage abstinence from alcohol actually do so.