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OBAMA AGENDA: Why Congress is going to have a hard time blocking any Iran deal

"Iran has offered "constructive solutions" to resolve disputes in nuclear talks with six major powers, the Iranian Students news agency ISNA reported on Wednesday, but Western officials suggested they had heard nothing new from Tehran," Reuters reports.

Congress is all but powerless to actually stop the Iran deal, notes POLITICO.

The Obama administration will unveil new rules today to require cities and towns to report on racial bias in their housing patterns, the Washington Post reports.

The latest in the eurozone, from the Wall Street Journal: "Greece formally requested a three-year bailout from the eurozone’s rescue fund Wednesday and pledged to start implementing some of the overhauls demanded by creditors by early next week, according to a copy of the request seen by The Wall Street Journal. Crucially for Greece’s creditors, the letter says the government would start implementing some measures, including on taxation and pensions, by the beginning of next week, though it doesn’t go into details."

The Confederate flag debate is in its final days in South Carolina. From The State: "The S.C. House begins debate Wednesday on a bill approved by the Senate to banish the Civil War icon that has flown at the capitol for more than five decades. The bill needs two more votes to reach Gov. Nikki Haley’s desk. The flag could come down as early as Thursday."

OFF TO THE RACES: Just how durable is the Dems’ Latino advantage?

Greg Sargent asks how durable the Democratic advantage with Latinos really is.

The Wall Street Journal notes how the Ex-Im bank has become a political football: "Ex-Im backers are confident they have the votes in Congress to reauthorize the agency as early as this month, but they could see a last volley of pushback from presidential candidates within a Republican Party that is casting a wary eye on government backing of private enterprise. The trio of Senate Republicans, in particular, could use an array of procedural rules to modestly delay reauthorization."

CLINTON: In her interview with CNN, she defended her use of a private email server, saying she went "above and beyond" to disclose all work-related correspondence, NBC's Andrew Rafferty writes.

And she talked Trump, pivoting to explicit criticisms of the GOP field as a whole and specifically of Jeb Bush on immigration.

Some real talk from the Washington Post's Ed O'Keefe: "Jeb Bush and Hillary Clinton accuse each other of flip-flopping on immigration — and they’re both right"

NBC's Alex Moe reports that Clinton will meet with House and Senate Democrats next week as well as with the Congressional Black Caucus, the Congressional Hispanic Caucus and the Congressional Asian Pacific American Caucus.

CHRISTIE: From NJ.com: "Gov. Chris Christie on Tuesday signed into law a 50 percent increase in a tax credit for low-income workers in New Jersey, more than reversing his own cut to the anti-poverty program in 2010."

Kelly O'Donnell reports that Christie isn't going anywhere despite state Democrats' efforts to force him to resign.

GILMORE: He told the Richmond Times-Dispatch that he'll announce a presidential run next month.

GRAHAM: He'll lay out his ISIS strategy in Washington this morning.

O'MALLEY: He's advocating a debt-free college plan, proposing that all students should have access to a debt-free college education within 5 years, attainable at any in-state public college or university.

RUBIO: He writes in a New York Times op-ed on Cuba: "When we make engagement with the odious leaders of these countries our foreign policy, we make a Faustian bargain that is contrary to our national values and also to our strategic interests. Instead of the administration’s approach — one-sided concessions that have served only to reward Cuba’s rulers despite their lack of reform — we should be stating clearly what reforms America expects before we deepen ties."

SANDERS: In a Q&A with the Des Moines Register, he laid out what he means by calling himself a socialist.

TRUMP: Rudy Giuliani commented on Donald Trump's rhetoric about Mexicans during an interview on Hardball, saying "Donald's a friend of mine, I respect him. He is an unbiased man. I think he said it in reverse. What he should have said is that most people who come across the border come across the border for economic reasons." MORE: "Well, hidden with them, because they're coming across unchecked, are people who rape people, murder people, kill people, and are terrorists. I've prosecuted all of them. And the reality is neither side wants to meet each other here."

Benjy Sarlin reports on how Trump is creating headaches for John Kasich, too.

WALKER: His advisers see just two principal rivals: Jeb Bush and Marco Rubio.

CNN reports that Walker is planning a Super Tuesday blitz after officially jumping into the race.

And he'll spend three days in Iowa in an RV, the Des Moines Register reports.

And around the country:

Via NBC Chicago: "State Sen. Darin LaHood won the GOP nomination Tuesday in the race to replace disgraced ex-U.S. Rep. Aaron Schock, defeating an anti-establishment conservative writer in a heavily Republican swath of central Illinois.

LaHood heads into the Sept. 10 special general election as the favorite to succeed Schock, once a rising GOP star who resigned in March amid intensifying questions about his use of campaign and taxpayer funds."

PROGRAMMING NOTES.

*** Wednesday’s “News Nation with Tamron Hall” line-up: Tamron Hall speaks with Democratic Strategist Robert Zimmerman and Republican Strategist John Feehery about Hillary Clinton’s first one on one interview since announcing her candidacy for President, NBC News Reporter Gabe Gutierrez about the latest on Subway spokesperson Jared Fogle and his possible tie to a child porn investigation, NBC’s Keir Simmons on the latest on the financial situation in Greece, and Supermodel and Author of: The Face that Changed it All Beverly Johnson about the latest on new revelations regarding Bill Cosby..

*** Wednesday’s “Andrea Mitchell Reports” line-up: NBC’s Andrea Mitchell continues to report on Iran nuclear negotiations from Vienna, Austria. She’ll interview cyber security expert Kevin Mandia. NBC’s Kristen Welker will interview Vermont Gov. Peter Shumlin, National Institute on Drug Abuse Director Dr. Nora Volkow, the Washington Post’s Jonathan Capehart, AP’s Julie Pace, msnbc’s Joy Reid and NBC’s Anne Thompson and Keir Simmons.