I'm sure that one reason Hillary Clinton is still running is to stay in the race in case she can get the Democatic nomination through some unexpected twist of fate. Another reason may have something to do with campaign finances. But a third reason is probably to show us what she's made of.
I think that Obama himself has already shown the way to start to get HRC to let her guard down: to treat her with kindness that she doesn't expect.
Maybe it would be helpful if Obama would come here and to other Web message boards and, under his own name, officially post a statement saying something like the following: "I know all kinds of unpleasant things get said during a campaign, but I was serious when I said that Hillary Clinton was my friend before the primary season started and will be my friend once it's over. When you write about Hillary, please understand that you're writing about my friend."