CNN

Watch Suzanne Malveaux's preview of Sen. Obama's historic speech.

DENVER (CNN) – Suzanne Malveaux previews Sen. Obama’s much anticipated acceptance speech set for Thursday night at Invesco Field.

Obama will deliver his speech 45 years to do the day that Rev. Dr. Martin Luther King, Jr. gave his landmark “I Have a Dream” speech on the steps of the Lincoln Memorial. As the first African-American nominee of a major political party, Obama is viewed by many as the fulfillment of the vision set forth by King.

Watch: 'We still have a dream'

But, in addition to addressing the lofty, historic nature of his candidacy, Obama also plans to draw clear contrasts between himself and his rival Sen. John McCain.

Watch: Obama’s big moment