The latest Pew poll finds that Americans are concernced about Iran:
When asked which country represents the greatest danger to the U.S., more Americans volunteer Iran (28%) than name any other country, though nearly as many (22%) name China. North Korea (8%), Iraq (7%) and Afghanistan (5%) are mentioned by smaller proportions of the public.
The percentage naming Iran has more than doubled since last January (from 12% then to 28% today); opinions today are on par with those in 2006 and 2007. Compared with last year, fewer now cite North Korea as the most dangerous nation (8% today, 18% then), while about as many say China as did so last January (22% today, 20% last year).