Mr Obama did not attend the rally on September 20th, perhaps because he was busy running for president, but perhaps also because he was loth to link arms with Mr Sharpton and Mr Jackson on this issue.

• 奥巴马没有出席9月20日的集会，或是因为他的总统竞选太忙；或是他不愿意与夏普顿和杰克逊掺和到一起。