diberry - 6:39 pm on Oct 16, 2013 (gmt 0)
Uncertainty about whether the United States will continue to pay its bills or very possibly crash the world economy.
I'm small potatoes and may not be representative of other advertisers, but I know *I* am holding back on my ad campaigns because it looks to me like my target demographics are all glued to CNN when they'd normally be visiting me and the sites I advertise on. No point running ads if no one sees them.
I'm hopeful Congress will reach a deal and things can go back to normal... ish. Until January. /eyeroll If so, I might run some campaigns this week or next.