Obama’s text message announcing he has chosen Joe Biden as his running mate, lacking a disclaimer indicating who paid for it, reads:

From: 622-62

Barack has chosen Senator Joe Biden to be our VP nominee.  Watch the first Obama-Biden rally live at 3pm ET on www.BarackObama.com. Spread the word!

August 23, 3:29 AM

So why doesn’t it need a disclaimer (and a disclaimer in a box, for that matter)?  Because of this?