Rachel says it better than I can (as it is lunchtime and I am on a course)
"Dear American readers, If you are lucky enough to have a vote in the US elections, please use it. Even though the lines may be long, the system chaotic, the weather bad, your feet sore, the pollsters telling you that you don't need to, he'll win anyway...please vote. Thank you. Really, thank you. And I hope that you have a great day."