Greg Mankiw:

Democratic critics of the [Ryan] plan suggest that enacting it would be akin to pushing Grandma over a cliff. But they rarely point out that the premium-support model is in some ways similar to the system set up under President Obama’s health care law. If choosing among competing private plans on a government-regulated exchange is a good idea for someone at age 50, why is it so horrific for someone who is 70?

Obamacare was a political compromise. It's better than nothing and Medicare is better than Obamacare.*

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*My theory is that after winning in 2008, Obama's people decided Romney was their most likely opponent in 2012. After passing the ARRA, they went to work to pass Romneycare and drew out the process (town halls, lengthy committee debates) so that it would really sink in with the conservative base that they hate Romneycare and therefore Obama's strongest opponent in 2012 would be tainted by the association and have a more difficult time in the primaries. But man that Mankiw really is a hack, isn't he?