If I could turn back time

Megan McArdle looks at the difficulty looming next year - if Democrats want to "tweak" Obamacare.
And this is true of every idea that starts with “All we need to do.” If “All we need to do” to fix some substantial problem were cheap and politically popular, it would already have been done, and we wouldn’t be talking about it. The stuff we argue about is, almost by definition, the stuff that’s hard.
Needless to say, Republicans are not going to be eager to do something hard and unpopular largely in order to save a program that was passed over their strenuous objections and is now hurting their political opponents. So if all we need to do is persuade Republicans to abandon their objections to Obamacare, and possibly their own electoral futures, in order to bail Democrats out of the mess they created, then we’re all going to be living with these problems for a very long time.