So does this site save the poll data it gathers from tumblr every ~minute? It sure does! And you can download it here!
If that's not what you wanted, I have other pages available:
Note: The 'time' column may look like a random number, but it is in fact a timestamp, you should be able to go "format as date" in your spreadsheet and then it's a date.
If you don't want to deal with all these individual files, you can download everything in one zip file. (It may be up to 15 minutes out of date.)