As I said in the comments, you can use Google search `site:twitter.com inurl:status +palinemails`. There isn't a canonical resource that holds all Twitter archives publicly. Try checking this related question to see if it can assist you in searching for other tweets labelled with `#palinemails`.

http://webapps.stackexchange.com/questions/657/how-can-i-backup-all-of-my-tweets