Duke is not representative of all republicans, all republicans are not racists, and conservative dogma does not condone racism.
This does illustrate again, however, that most racists such as Duke identify as conservative, and feel most comfortable with republicans.
It's incumbent upon republicans and conservatives, therefore, to discover why racists are attracted to the republican agenda, and conservative dogma, and address the problem.
Until the problem is discovered and resolved, Scalise won't be the last republican embarrassed by racists among GOP ranks.