"Impossible is just a big word thrown around by small men who find it easier to live in the world they've been given than to explore the power they have to change it. Impossible is not a fact. It's an opinion. Impossible is not a declaration. It's a dare. Impossible is potential. Impossible is temporary. Impossible is nothing.”
~ Muhammad Ali
This seems a little too deliberate and calculated for it to be a random phrase by Obama. Now, it seems like the plan was to raise this issue to re-introduce McCain's past sexist remarks:
This whole episode is not trivial. It has had a direct effect on me, and I am livid at Obama.
I have used this phrase several times to great effect in closing arguments to juries. It always gets a laugh, and underscores just how stupid opposing counsel's story is. I am allowed to use this phrase due to my hard-earned rural cred. Thanks to Obama trying to country it up and connect with those voters he used to think were bitter when they supported Hilary, I can't use it anymore.