A few data points to consider:
My father (white male, age 70) consistently voted Republican in presidential elections until at least 2000. Earlier this year he said he would probably vote for Bloomberg if he were to announce an independent bid. Following Bloomberg's announcement that he would not run, Obama became his candidate of choice. He thinks McCain is to old to be president ("He's as old as I am!"). He respects McCain's record of military service but thinks McCain doesn't really know what he's talking about when it comes to economic and foreign policy.
My mother (white female, age 68) notes that she is in the demographic that is supposed to be Sen. Clinton's base of support. However, she finds Barack Obama to be inspiring and eagerly looks forward to voting for him in the fall. Hillary Clinton, on the other hand, reminds her of Tracy Flick.
I only wish my parents lived in Pennsylvania.