Thanks to the all new, all shiny political science peer-review survey, there is at least an answer to the last question: about 30 per cent of our respondents say that they would submit a rejected manuscript to a less prestigious journal. But what really strikes me is the proportion of reviewers who have reviewed (and rejected?) the same manuscript for at least two different journals: 29 per cent. This squares nicely with my personal experience (sometimes I seem to hit the same wall twice or more) and points to the fact that political science is a small world. Too small perhaps.
The survey is still open, so if your are an active political scientist, please, please participate and share your experience with us! We will publish preliminary results of the peer review survey online and will eventually put the data into the public domain.