A visitor to this site asked me:

Q:

How can I find out what a particular representative voted upon and then went back to change his/her vote? I understand that this is done very often so that the hometown folks think that he/she voted one way, but that they go back and change the actual vote recorded later.

Was it really true that Members of Congress can change their votes?

As it turns out, actual votes cannot be changed after the fact, though that may not be the whole story. To find this out, I asked my expert colleagues. The first answer I got came from a very knowledgeable Congressional staffer who wrote: