After Ohio and Texas: What's Changed and What's the Same?

John McCain has wrapped up his party's nomination, but Hillary Clinton has bounced back again with a big win in Ohio and a squeaker in Texas, enough to make sure that she and Barack Obama will be campaigning for weeks to come. While McCain gets a unifying White House blessing, the Democrats are likely to remain divided all the way to the August convention. We look at the exit polls and what they say about change, experience and the impact of negative campaigning? Do Republicans really like McCain all that much? Will Democratic divisions be a source of weakness or strength come November?