Not true.
During a recent meeting with President Fernando Henrique Cardoso of Brazil, President Bush asked in surprise, “Do you have blacks too?” Joe Sobran.
Actually the Brazilian press reported the question as "Do you have blacks also?"
The Editorial quoted above was called "A retumbante ignorância." Translated to English that's "A resounding ignorance."
Of course it was first reported in Germany's "Der Spiegel" here: Gibt es Schwarze in Brasilien?