Is there any way to search ALL of Craigslist?

On their "help", it makes it sound like you can do a search without picking a region, but there's no search box until you click on a city. Once you do that, it apparently only searches in that city.

You can google "craigslist widget" or whatever, and that will pull up SOME of the craigslist pages featuring that widget. I haven't figured out why, but it doesn't pull up ALL of them. I've seen specific bicycles come and go over a week or two and never show up in a Google search.

Just curious if I was overlooking something obvious here.