Ahhh... You had me wondering what was going on there for a second.
Did you just change the text and then look at the front page, and see that the text on the articles you had already voted for had changed to 'blah blah'?
If you create a new story, and then click the vote button for it, you'll see that it won't change to 'blah blah' like you have set, but instead will change to 'voted' as hardcoded in the xmlhttp.js and php files
If you then reload the page, the expected value of 'blah blah' will show up..
I'm just wondering if it would be possible to have the xmlhttp.js and .php files reference the "PLIGG_Visual_Vote_Cast" variable instead of being hardcoded to say 'voted'.
Cheers.