I was having a lot of trouble publishing my presentation to my blog until I figured out that you have to make a copy of it first in Google docs. If anyone else is having trouble, try making a copy and then publish the copy. It worked for me.
To make a copy...
1. open the document you want to copy
2. Under "file" you will find "make a copy"
3. proceed with publishing the document
Here is mine and Pat's...A little late but better than not at all.