"Well, that's tacky"

I wrote earlier about the President misnaming the founder of the Republican Party.  It looks like an ad lib on the part of President Obama.  The reason we know this is the difference between the PBS transcript of the speech and that of The New York Times.  The latter has the line in and the former does not.  The American Thinker thought it was manipulation, but Byron York EMails The Instapundit and says that it is just that PBS posted the speech text as provided by the White House, while The New York Times gives us the actual transcript.

The "tacky" part is that PBS has been deleting comments and not explaining why.  Should we expect better of PBS?

Regards  —  Cliff