I managed to re write a poll I had written without the help of the Edit button. I saved it in draft and then I went through the normal procedure to get back to it. You will get a message to say you have no right but you will find it in the draft folder.
It had the appearnace of a published post. I copied the content. I opened a fresh poll page and pasted the content from the draft post on to the new poll page. I had to once again upload the image.
I got through and I could publish my post. The draft post stayed in the draft folder. No doubt a cumbersome procedure but atleast this way you can get hold of that draft and rewrite the post.
If you have a better method would love to know about it
Do you have a better method?