polls are meaningless at this point
Here is another meaningless poll.
http://www.kansascity.com/news/local/news-columns-blogs/the-buzz/article30832281.html
polls mean dollars.
jbush needs his vote splitters to stay in the race.
But beyond that, they spark donations and volunteers. NO ONE will volunteer long for (or certainly give much money to) a candidate who can't get above 5% anywhere. That's why Santorum is pretty much done, Perry is already unable to pay his staff in SC, and Jindal, Gilmore, Graham, and Christie are probably gonna be gone quickly. I would bet that Kasich and Huckabee are the next to go.
Then it will be tricky to see how long Rubio can keep raising money with Bush in the race (or vice versa), how long Carson's support hangs in, and what happens to Walker, because these would be the next trio on the bubble.