1. Joshua Tucker notes that we don’t have any idea whether anything about Chechnya and surrounding areas will prove to be relevant at all to Boston, but also has links to the best research on that area of the world and political violence.

2. For more caution, see a very sensible item on jumping to conclusions from Marc Ambinder.

3. And excellent reporting on one of the stories the press got horribly wrong: Alexis Madrigal on how the wrong names were reported late last night.

4. Yes, Lindsey Graham’s reaction to Boston is breathtakingly stupid and wrong. David Graham (no relation to the reckless Senator) has the details.

5. Although the Obama administration hardly has a strong record on terrorism and Miranda, as Glenn Greenwald tweets.

6. Chuck Grassley signals that he’s going to use Boston as a reason to oppose the immigration bill.

7. Steve King, too, attempts to use early rumors about the bombers against immigration reform.

8. But it’s not unanimous within the GOP. Marco Rubio and Mario Diaz-Balart fight back against Grassley.

9. Dana Milbank is tough, and with good reason, on Ted Cruz — and his “trademark falsehoods.”

10. Timothy Johnson suggests not telling Ronald Reagan or George W. Bush about those insulting conservative talking points about the advocates for gun violence legislation — you know, the “props.”

11. Of course background checks were killed by filibuster, says Ed Kilgore.

12. Remember the scare that sequestration would lengthen lines at airports, and then the accusations of hype when it didn’t happen right away? Oops: it’s coming. Matthew Wald reports.

13. Kevin Drum argues that Tea Party wins on guns will only make them hungry for more when it comes to immigration.

14. Back to Boston: no, don’t believe some of the more outlandish reports about economic costs. Matt Yglesias throws common sense at it.

15. What it’s like within an immigrant community when one of your own is responsible, from Joan Walsh.

16. And one from me, on why political responses to events such as the Boston bombing are not only appropriate, but extremely patriotic. And why they should be tempered by etiquette and prudence.