Which is better for grinding coffee: Food processor or blender? Which is better for grinding coffee for use in a drip coffee maker: Food processor or blender?

Update: I noticed that my food processor makes evenly-sized course grounds, and my blender grinds smaller, but unevenly: fine, packed dust and medium-course grounds.

Conclusion from my experimentation: A blender is overall better.
I guess both food processors and blenders would act like big blade grinders. Blade grinders give particles of a wide range of sizes, from fine dust to chunks.  This gives uneven flavor extraction (if you can taste it), and requires the use of the finest filter.  If I had to choose, a small food processor might be superior, since the blades on blenders are pitched to stir more than to cut.  

Lacking a burr grinder, which gives more consistent particle size and therefore predictable extraction, I'd repurpose an old pepper grinder!