It sounds to me like one of those "possible but not probable." I would be totally surprised and somewhat taken if President Bush used the death of Rosa Parks to forward an agenda.
key word "AGENDA" would not look good...I see Jesse and Sharpie all over it.
JRB good choice...but her memorial would not be a good choice to propose it.
President Bush would do better to say on this highest memorial toward Miss Parks. I want all politics aside and give a day without any other remarks to claim the day except that of her memory.
I think Bush is too good a man to use the death of an old woman as a political opportunity. He may well nominate JRB, but I doubt he will try too hard to link her nomination to Park's life or death.