MLK's actions would have been useless without Thurgood Marshal and the NAACP in the 40's and 50's and futile without the affirmation of the government (via LBJ).

LBJ's actions would have been meaningless or at least completely unexpected without the actions and efforts and words and leadership of MLK.

Hillary never marginalized MLK. She said it took government action to make MLK's dreams codified in law. MLK didn't get to lead his people into the promised land either - he set them on the path.

But why does Obama want to be President if he thinks MLK was the best it gets and President is irrelevant? Why wouldn't Obama aspire to be "The Greatest" - whether a street preacher or organizer or boxer?

What Hillary said:
I would point to the fact that Dr. King's dream began to be realized when President Lyndon Johnson passed the Civil Rights Act of 1964, when he was able to get through Congress something that President Kennedy was hopeful to do, the president before [Eisenhower] had not even tried, but it took a president to get it done. That dream became a reality. The power of that dream became real in people's lives because we had a president who said, "We are going to do it," and actually got it accomplished.

She said "power of that dream" - i.e. it was MLK's tune that LBJ was riffing on, no? Why exactly did MLK even work with LBJ if LBJ's part wasn't important and necessary?

Now, you can question whether passing the law was the same as implementing it - the same issue with Thurgood Marshall as he fought to have courts actually recognize and rule what was already on the books and in the Constitution primarily, not passing new legislation. And MLK had exactly this criticism of it, though it should be remembered that those on the wrong side of justice seldom are impressed with how quickly the Wheels of Justice turn:

The past record of the federal government, however, has not been encouraging. No president has really done very much for the American Negro, though the past two presidents have received much undeserved credit for helping us. This credit has accrued to Lyndon Johnson and John Kennedy only because it was during their administrations that Negroes began doing more for themselves. Kennedy didn't voluntarily submit a civil rights bill, nor did Lyndon Johnson. In fact, both told us at one time that such legislation was impossible. President Johnson did respond realistically to the signs of the times and used his skills as a legislator to get bills through Congress that other men might not have gotten through. I must point out, in all honesty, however, that President Johnson has not been nearly so diligent in implementing the bills he has helped shepherd through Congress.

But no one here is making this point - they're just saying Hillary demeaned and marginalized MLK. It takes teamwork and widespread recognition of goals to get anything done. MLK didn't march to Selma by himself either. Good followers are as important as good leaders.