The question is whether this "some" represents a non-negligible amount.
To mean anything, it would not only have to be non-negligible, but also be more common among Republicans than non-Republicans. There are no statistics for child abuse by political affiliation, but there are statistics by race, which is rough proxy. Child abuse is significantly higher than average among Native Americans (much higher than any other ethnic group), blacks, and Hispanics. None of these groups lean Republican. It is also higher in rural areas, which do lean Republican. So who knows?
The point of Lakoff's book is that people should not let themselves be manipulated by people twisting words around, yet he does the same thing.