Obama Campaign Lies About Number Of People At Rally

Of the LVRJ: Obama was cheered on by about 11,200 supporters spread across the lawn at Desert Pines High School, according to his campaign's official crowd count.
 http://www.lvrj.com/news/obama-visits-las-vegas-171964601.html
So, the LVRJ writer relies the Obama campaign for official numbers?  How lazy is that of the writer.
There were maybe half that number at the rally, around 6000.  Hell, I heard an Obama official say they had 10,000 and now they say they had 11,200.  Where did the extra 1,200 come from?  Probably from where the other 5000 people came from.  From someone's imagination?
Apparently, other media are also reporting the lie.  The Las Vegas Sun and Channel 13 are also reporting the lie.
And the national is also believing the Obama campaign numbers.  Why?  Do they believe Romney campaign estimates in crowd numbers?  I doubt that.