* Another interesting line from Mitch McConnell’s remarks on why Republicans are waiting for Mitt Romney to take a position on Obama’s immigration move:

“He is the leader of our party from now until November.”

As one Dem joked to me, you’d think that might make it tougher for him to avoid taking positions going forward.

* Charlie Pierce tries to get Marco Rubio to explain why Obama’s “stopgap” solution isn’t alone praiseworthy, in that it constitutes some movement in the direction Rubio himself wants to go.

* Obama reelect reality check of the day: Stuart Rothenberg on why Obama is now in “serious trouble” and is the “narrow underdog” for reelection.

The big question: Whether polls showing Obama narrowly up right now are lagging behind public opinion that is already in the process of sagging along with the recovery.

* Peter Baker and Michael Cooper have an epic fact check of both presidential candidates’ assertions. It doesn’t take a stand on who is the worse dissembler, but it’s not a bad jumping off point for that debate — and it even hits on some of the core Romney claims that readers of this blog will find familiar.

* A pro-Romney super PAC dumps millions into a TV ad campaign highlighting Obama’s "private sector is doing fine” remark, another sign it will be with us from now until Election Day.

* Obama’s campaign calls on Crossroads GPS to disclose its donors, which won’t happen, but the argument about Crossroads running out the clock so disclosure happens when it’s too late is an interesting one.

* As the First Read crew notes, the crush of advertising focused on Virginia, Ohio and Colorado is remarkable, and reminds us that those three states may decide the race.

* Mike Tomasky on the right’s new misinformation campaign in service of a clear goal: “this is the world conseratives now want to create — unlimited campaign donations, and we’ll never know from whom.”

* Relatedly, Andy Kroll on the sordid history of dark money in our politics, and how the current battles resonate with other epic fights to reform a system that always seems to lapse back into scandal.

* Bonus Dem reality check of the day: The Dems’ chances of taking back the House seem to be slipping away, and they may only net some 10-15 of the 35 seats they need..

* Scott Brown scuttles the debate with Elizabeth Warren after Vicki Kennedy refuses his demand that she muzzle herself about her preference in the race.

* Markos Moulitsas comments on Brown’s move: “this isn’t about some high-minded pursuit of neutrality, but of fearing a genuinely neutral forum hosted by an experienced neutral debate moderator on television, where people might actually see him try and defend his conservative record.”

* Steve Benen, on Romney and the curious case of the 33-page change-of-address form: “if government is so awful, and the public bureaucracy is such a Brazil-like nightmare, why can’t Romney point to real examples instead of passing along nonsense?”

* And blunt talk from Jonathan Bernstein: Yes, Republicans really are different today, and yes, they really are the problem.

What else?