Members of Congress have no power, indeed they have no rights, to arrogate to themselves the power to nullify an election absent such a compelling threat.

CNN: Transcript: Opening statement of Rep. Nadler

Musharraf placed the country under a six-week state of emergency late last year, during which he ousted most of the Supreme Court justices who had been expected to nullify his recent election victory on constitutional grounds.

CNN: Gates: U.S. willing to send troops to Pakistan

This week election officials in the state of Washington announced that a referendum seeking to nullify the recently passed law legalizing same-sex marriage has qualified for the November ballot.

CNN: The secret gay agenda

Now, it didn't open until eight, which is feeding a lot of suspicion on the ground here, that there have been efforts to rig this election, that there've been efforts to nullify their votes - efforts on the part of the government, which, of course, is headed by the incumbent, President Mwai Kibaki.

NPR: Kenyans Vote in Presidential Election