Recap: The pro-Social Security argument for Social Security reform (and a follow-up); some useful political-science research suggesting that a government shutdown could help Obama and hurt both parties in Congress; and the political economy of entitlement reform in two tables.

Elsewhere:

1) I’ll be talking about the budget showdown on “The Last Word” with Lawrence O’Donnell tonight.

2) Does Rick Santorum realize that this sort of thinking implies more immigration, not more forced pregnancy?

3) A new concept I’m glad to know: Campbell’s law.

4) Amazon takes your music into the cloud.