Literally translated it means "the compulsion to move" but the term is used to denote a situation in which all moves are bad and worsen one's position, and one would be better off being able to pass the move to the opponent.
Piling onto an obviously qualified nominee will further erode what little support among Hispanics there is. Failing to vigorously oppose the nomination is probably the best option but the GOP is setting itself up to fail because people like Newt and Rush calling her "racist" etc. are putting the party in a place where if they don't oppose her nomination they will disappoint some of the knuckle draggers.
And allowing the nomination to go through with only token opposition will not only allow Obama to appoint a qualified Justice (a win for EVERYONE), but it will also likely increase his support, and the support of the Democratic Party, among the Hispanic community.
Zugzwang, baby. Learn it, love it.
I think Obama is as good at chess as he is at basketball.
http://en.wikipedia.org/wiki/ZugzwangWhoever has to move, loses