Interesting read:
http://www.theatlantic.com/doc/200809u/palin-eagletonInterviews with Republicans and legal experts today shed light on how the process could play out. At any point before tomorrow night, McCain could simply replace Palin. But once she formally accepts her nomination, he’ll no longer have the power to do so unilaterally. According to Ben Ginsberg, the former general council at the Republican National Committee, Republican rules stipulate that the 168 members of the national committee would need to ratify any replacement to make it official. The process falls under Republican Rule Number 9(a): “The Republican National Committee is hereby authorized and empowered to fill any and all vacancies which may occur by reason of death, declination, or otherwise of the Republican candidate for President of the United States or the Republican candidate for Vice President of the United States, as nominated by the national convention, or the Republican National Committee may reconvene the national convention for the purpose of filling any such vacancies.”