The collapse of ObamaCare is the tip of the iceberg for the magical Obama presidency.

From the moment he emerged in the public eye with his 2004 speech at the Democratic Convention and through his astonishing defeat of the Clintons in 2008, Barack Obama's calling card has been credibility. He speaks, and enough of the world believes to keep his presidency afloat. Or used to.

All of a sudden, from Washington to Riyadh, Barack Obama's credibility is melting.

Amid the predictable collapse the past week of HealthCare.gov's too-complex technology, not enough notice was given to Sen. Marco Rubio's statement that the chances for success on immigration reform are about dead. Why? Because, said Sen. Rubio, there is "a lack of trust" in the president's commitments.

"This notion that they're going to get in a room and negotiate a deal with the president on immigration," Sen. Rubio said Sunday on Fox News, "is much more difficult to do" after the shutdown negotiations of the past three weeks.