Tuesdays without primaries feel strange. But there was plenty going on, including these final items:

* At College Guide, Daniel Luzer discusses a new Demos study showing long term trend of public disinvestment in public universities, with students and their parents taking up the slack, most through debt.

* Dean Baker, Jared Bernstein, and Paul Krugman all tear Robert Samuelson a new one over latest “entitement reform” op-ed.

* Despite Santorum’s withdrawal, Ron Paul not going anywhere right away.

* George Zimmerman’s lawyers announce they’ve withdrawn from his case, say he’s talking to Sean Hannity.

* Matt Yglesias compares vast size of mortgage interest deduction to low-income housing subsidies.

And in non-political news:

* Sales of Madonna’s new album plunge 88% in a week.

Have to write column tonight summing up greater meaning of Santorum campaign. Wish me luck!

Selah.

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Ed Kilgore is a political columnist for New York Magazine; a longtime contributor to the Washington Monthly; and a former policy adviser to three governors and a U.S. senator from his home state of Georgia.