Did Hillary just alienate black voters?

Hillary Clinton has been trying to raise doubts about Barack Obama by talking about the limits of hope. Obama has counter-punched by pointing out that many of the greatest advances in American history were due to hope and that hope is an essential American quality; one that inspired the Colonists in 1776, the abolitionists and  the civil rights movement among others. The trailblazing nature of his candidacy makes this a particularly effective rejoinder. 

Now, Ben Smith is reporting that Hillary said this to Fox News:

“Dr. King’s dream began to be realized when President Johnson passed the Civil Rights Act,” Clinton said. “It took a president to get it done.”