Is CBS in the Republican's pocket?

Here's a couple articles that bring that question up...and from their last couple actions- not allowing the MoveOn.org ad to air during the Super Bowl and canceling the Ronald Reagan mini-series but allowing ads from the White House Office of National Drug Control Policy- they seem to showing their political slant.
Bush Helps CBS, CBS Helps Bush
Thinking in Public- Free the Press from the Cornell Daily Sun.