Whether you agree with Jackson or not, it certainly was not a racist column. The literary device of claiming to want a white president was an expression of frustration with race card players, not an expression of anti-Black sentiment. Any fair-minded person reading Jackson’s column would see that.
When Wurzelbacher cross-posted the column, he did it the way many people do (and how we do it at Legal Insurrection), post an excerpt and prominently link over to the original. Wurzelbacher could have been more explicit that it was written by someone else, but it didn’t take much to figure it out when looking at the cross-post.