webcentric - 8:31 pm on Oct 2, 2013 (gmt 0)
Marketers may not even be thinking of this from a trickle down affect on spending but rather a "where are people's attention" standpoint.
Which is exactly why it might be a great time to be operating an editorial website focused on US politics. If you are, you may be noticing a spike in traffic at the very least. You're right, this isn't 9/11 which leads me to believe that the impact is going to be more niche oriented (over the short term). Of course, if this goes on long enough, it's got the potential to mess up practically everyone.