Votes on Meta often signify agreement/disagreement on content and not research-usefulness-clarity. Shouldn't the tool tips match that, so newbies like me won't get confused? I suggest "I support the idea of this question"/"I oppose the idea of this question".
As noted in comments above, the same proposal has been made, and has had many, many eyes on it for quite some time, on Meta Stack Exchange. Please see there for more information and future updates.
I'm posting this here just to get this question off of the list of unanswered questions here.