Do you really have some background on Card backing Souter?
From a quick Google search:
"Conservatives still recall that in the White House of the first President Bush, Mr. Card was deputy chief of staff to Mr. Sununu, the prime backer of Judge Souter. Mr. Card told me on Friday that 'it would be a complete exaggeration to say I played a role in the Souter selection. I merely supported his nomination as I did all presidential appointments.'"