Barack Obama and John McCain both have big-ticket proposals to change how people obtain and pay for health insurance, and a long history of failed health-reform plans shows how difficult it is to achieve that goal. But despite the worsening economic picture, neither candidate has signaled any intention to scale back his plans. And the head of the Senate Finance Committee, which would have a big say in what the next president hopes to accomplish on healthcare, says he won't let the current financial crisis stop the committee from tackling it.