As far as I can tell, there are four Republicans who have publicly admitted that Medicare needs to be cut: Romney, Daniels, Christie, and Ryan.A quick search uncovered the following:
Sarah Palin: Why I Support the Ryan Road Map
...In my view, a better plan is the Roadmap for America's Future produced by Rep. Paul Ryan (R., Wisc.). The Roadmap offers a reliable path to long-term solvency for our entitlement programs, and it does so by encouraging personal responsibility and independence.Sarah Palin: Obama and the Bureaucratization of Health Care
Beyond that, Rep. Ryan proposes fundamental reform of Medicare for those under 55 by turning the current benefit into a voucher with which people can purchase their own care.
On Social Security, as with Medicare, the Roadmap honors our commitments to those who are already receiving benefits by guaranteeing all existing rights to people over the age of 55. Those below that age are offered a choice: They can remain in the traditional government-run system or direct a portion of their payroll taxes to personal accounts, owned by them, managed by the Social Security Administration and guaranteed by the federal government. Under the Roadmap's proposals, they can pass these savings onto their heirs. The current Medicaid system, the majority of which is paid for by the federal government but administered by the states, would be replaced by a block-grant system that would reward economizing states....
...Instead of poll-driven “solutions,” let’s talk about real health-care reform: market-oriented, patient-centered, and result-driven. As the Cato Institute’s Michael Cannon and others have argued, such policies include giving all individuals the same tax benefits received by those who get coverage through their employers; providing Medicare recipients with vouchers that allow them to purchase their own coverage; reforming tort laws to potentially save billions each year in wasteful spending; and changing costly state regulations to allow people to buy insurance across state lines. Rather than another top-down government plan, let’s give Americans control over their own health care....Sarah Palin: An Open Letter to Republican Freshmen Members of Congress
...In order to avert a fiscal disaster, we will also need to check the growth of spending on our entitlement programs. That will be a huge challenge, but it must be confronted head on. We must do it in a humane way that honors the government’s current commitments to our fellow Americans while also keeping faith with future generations. We cannot rob from our children and grandchildren’s tomorrow to pay for our unchecked spending today...In addition, she has discussed entitlement programs in several interviews. In fact, it came up in her recent appearance at the Long Island Association's annual meeting.
In fairness to Pablo, I follow Palin much more closely than he does. However, I didn't need to reference her books to figure out where she stands on entitlement reform. It only took me about 2 minutes to compile the articles for this blog post.