Kofi, a report and a Senator:

The release of the United Nations’ long-awaited proposals for reform was marred yesterday when the senator leading an investigation into the controversial oil-for-food programme for Iraq called on Kofi Annan, the secretary-general, to resign.

Are we 100% certain that the verb "marred" is correct here? Enlivened, complemented, underlined,  boosted….those and others come to mind.