Greg Sargent has an excellent post today (following up on Ben Smith's catch; see also Michael Sheer) about conservative insistence that Barack Obama refuses to talk about "American exceptionalism" despite Obama's frequent, and in the SOTU, constant invocation of what a spiffy keen place the U. S. of A. is.
Beyond the specifics of this debate, this is a reminder that one side of a political argument really can't determine what the other side will say. You hear this all the time, often in wish form: If only the president would say X, then Republicans would have to stop saying Y. Or: the president's rhetoric boxed in his opponents, leaving them with no arguments.
This was nonsense back in the days of the explicitly neutral mass media, and it's if anything more nonsense today. Politics is not refereed by people who can disallow poor arguments; politicians can and will say what they think will work, regardless of how ill-supported it might be. That goes for "facts" and for arguments. Especially within their own partisan press, but even outside of it, both Republicans and Democrats are going to say what they want to say. That doesn't mean that presidents and others shouldn't make their best arguments, but those arguments just aren't going to end anything.