media weirdness in Obama speech

I was watching the election results with Bill Dwyer, a Forest Park neighbor.

We noticed that there was a difference between the WGN coverage of Obama's speech and MSNBC's coverage.

In WGN's coverage Obama's background included 2-4 African-Americans pictured with a large number of people who looked "White". In the MSNBC coverage the background was almost entirely African-American.

Bill and I went back and forth between channels. I concluded that there was no way different camera angles could account for the difference. Either WGN or MSNBC was doing something to alter who appeared behind the candidate on television.

WGN is a local outlet. MSNBC is a national outlet.

I'm going to avoid making explicit allegations, but I'd like some media experts to examine the difference and get the explanations from the two networks for the differences.