"What I've said is my top priority is making sure people are able to get enough to eat. If it turns out we need to make changes in our ethanol policy to help people get something to eat, that has got to be the step we take,"
Obama, May 4, 2008
They've all been for it and against it. You should use sourced quotes, otherwise the context is lost.
Clinton had a similar statement from the same article above
$this->bbcode_second_pass_quote('', '"')What we need to do is accelerate the research into farm waste and into other cellulosic plant materials. Because, I think, instead of using the corn, let's figure out if we can use the corn cob," she said. "Let's figure out if we can use the corn stalk. Let's figure out what other kind of food, you know, waste we can use."
Clinton added: "In the short run, we've got to work with our farmers and with like-minded people around the world to figure out how this increasing use in biofuels, which is part of our answer to our dependence on foreign oil, does not undermine food production and really accelerate the prices."