• Rep. Adam Schiff of the House Intelligence Committee calls in at 10am ET / 7am PT to talk about the exploding situation in Syria

• Sexy Liberal Hal Sparks calls in at 11am ET / 8am PT for a telephone edition of Humpdays With Hal

• President Obama and his European and Middle East allies have blamed Syrian President Bashar al-Assad for last week’s killing of hundreds of civilians. But the U.N. experts, who were first allowed to cross the front line by Assad’s forces on Monday, are still engaged in gathering evidence.

• Tens of thousands of people are expected to converge on the National Mall in D.C. today to commemorate the 50th anniversary of the Rev. Martin Luther King Jr. delivering his historic “I Have a Dream” speech to 250,000 supporters.

• Sens. John McCain and Jeff Flake, two Arizona Republican senators who helped craft the Senate immigration reform bill, said Tuesday that they are still hopeful that the GOP-led House will ultimately approve a measure that includes a path to citizenship for undocumented immigrants.

• Wal-Mart says it now will extend its health care benefits to its U.S. workers’ domestic partners, including those of the same sex. The Bentonville, Ark.-based discounter has 1.3 million full-time and part-time U.S. workers.