* Primary night! The Post politics team will be posting results right here, beginning around 8:30 p.m. Jonathan Bernstein will have reaction later right here on this blog.

* Sobering stuff from David Leonhardt: Obama’s reelection chances turn heavily on the direction of what now looks like the final pre-election turn in the economy, and he isn’t even in control of which way it goes.

* I’m late to this, but Ezra Klein’s much-discussed piece on the limits of presidential persuasion, and what that will mean for a president’s governing capacities if polarization increases, is an important read.

* Digby lays out the progressive case for the presidential bully-pulpit as an instrument not to win over people who will never agree with you, but to mobilize followers to pressure Congress into action.

* A new Reuters poll finds that Obama’s approval has now hit 50 percent, thanks to rising economic confidence.

These are vastly different findings from this week’s New York Times and Post polls, and wouldn’t you know it, but the Pollster polling average has him at 47 percent — right between today’s and yesterday’s surveys.

* Ed Morrisey has a good roadmap to what’s next for the GOP: Whatever happens in tonight’s primaries, this will continue to drag on, and the only potentially meaningful result would be Newt dropping out.

* From the exit polls: Enormous percentages of the GOP voters in Mississippi and Alabama are evangelicals, which should (in theory) cut against Romney.

* Relatedly: The Post polling team has created a very cool interactive tool for reading exit polls.

* As Steve Kornacki notes, a Romney win in one or both Deep South states might give him lots of media hype, but the real question is whether it will do anything to lessen conservative resistance to his candidacy.

* And if he does win, of course, the fact that Romney will have vastly outspent his foes to claim a bit more than a third of the vote deserves to be part of the discussion.

* Has Romney put Arizona in play for Obama? That it’s even being discussed at all shows how badly Romney’s embrace of extreme immigration positions may have damaged him among Latinos.

* And this could help the Dem case against Scott Walker, who pledged that his union-busting reforms would grow jobs: Wisconsin’s decline in non-farm jobs in 2011 was the worst in the U.S.

What else?