Yes , Witnesses are supposed to be politically neutral both Nationally and on a party level.
However, living in this world with its 24/7 news media,it is largely impossible to not form a personal opinion about things. I have found that these opinions are kept very private and are NOT expressed to the congregation at large. Only in a family chat at home are they free to speak their mind .
I found among elders that older brothers, who had fought WW2 in their younger days, would sometimes say comments that betrayed a more patriotic British attitude than I had. I just accepted that as personal differences due to a different upbringing.
The bottom line is that the Borg can make rules, but cannot rule what people still feel within. They should not say it though.