Obama's got a lot of ground to make up following that performance last weekend at the Saddleback presidential forum with pastor Rick Warren.

Obama's defenders spin his abominable performance in the Saddleback forum by saying he's just too smart to give a straight answer. As Rick Warren charitably described Obama's debate performance: "He likes to nuance things ... He's a constitutional attorney." The constitutional lawyer "does nuance," as Bill Maher said on "Larry King Live," "and you saw how well that goes over with the Rick Warren people."

If that's Obama's excuse, he ought to know a few basics about the Constitution.

Did the big constitutional lawyer whose "nuance" is too sophisticated for Rick Warren's audience see the letter his wife sent out on his behalf in 2004? Michelle Obama denounced a federal law banning partial-birth abortion, writing that "this ban on a legitimate medical procedure is clearly unconstitutional." Clearly!

The Supreme Court later found the law not "unconstitutional," but "constitutional" -- which I believe may have been the precise moment when Michelle Obama realized just how ashamed she had always been of her country.

But most stunningly, when Warren asked Obama if he supported a constitutional amendment defining marriage as between a man and a woman, Obama said he did not "because historically -- because historically, we have not defined marriage in our Constitution."

I don't care if you support a marriage amendment or not. That answer is literally the stupidest thing I've ever heard anyone say. If marriage were already defined in the Constitution, we wouldn't need an amendment, no?

Say, you know what else was "historically" not defined in the Constitution? Slavery. The words "slavery" and "slave" do not appear once in the original Constitution. The framers correctly thought it would sully the freedom-enshrining document to acknowledge the repellent practice. (Much like abortion!)

But in 1865, the 13th Amendment banned slavery throughout the land, in the first constitutional phrase ever to mention "slavery": "Neither slavery nor involuntary servitude, except as a punishment for crime whereof the party shall have been duly convicted, shall exist within the United States, or any place subject to their jurisdiction."

On Obama's "historical" argument, they shouldn't have passed the 13th Amendment because the Constitution "historically" had not mentioned slavery.

Do we know for a fact Barack Obama has read the Constitution? Obama's Facebook profile: "I'm pro-infanticide, I love sunsets, and I don't get the 13th Amendment!"

This is the guy who thinks he can condescend to Clarence Thomas? Asked at the Saddleback forum which Supreme Court justice Obama would not have nominated, Obama said ... the black one!

In Obama's defense, he said he thought Thomas wasn't experienced enough "at the time." So I guess Obama thinks Thomas should have to "wait his turn."

By contrast, Obama has experience pouring out of those big ears of his. Asked last year by Robin Roberts on ABC's "Good Morning America" about his lack of experience in foreign policy, Obama took umbrage.

Swelling up his puny little chest, Obama said: "Well, actually, my experience in foreign policy is probably more diverse than most others in the field. I'm somebody who has actually lived overseas, somebody who has studied overseas. I majored in international relations."

He actually cited his undergraduate major as a qualification to be president.

But on Saturday night, Obama said he didn't think Clarence Thomas was a "strong enough jurist or legal thinker" to be put on the Supreme Court.

I bet Thomas has heard of the 13th Amendment!