I only heard about 5 min of Mark last night, sadly.
On a practical strategery note: McCain has a powerful issue against Obama-- Obama's scandalous live 'abortion' issue. Being a hypocrite by choosing someone pro-choice undermines him. If his VEEP is pro-life, then he's well positioned to expose Obama. And even if Hellery squeaks and cackles through the nomination, it would not hurt to tap into the GOP energy of being pro-life.