Coretta Scott King (April 27, 1927 - January 30, 2006) was an American author, activist, civil rights leader, and the wife of Martin Luther King, Jr. Coretta Scott King helped lead the Civil Rights Movement in the 1960s. She was an active advocate for African-American equality. King met her husband while in college.

Coretta was viewed during her lifetime and posthumously as having striven to preserve her husband's legacy. The King Center, which she created the year of his assassination, allowed her husband's tomb to be memorialized. King was buried with her husband after her death, on February 7, 2006. King "fought to preserve his legacy" and her construction of the King Center is said to have aided in her efforts.  King has been linked and associated with Jacqueline Kennedy and Ethel Kennedy, as the three all lost their husbands to assassinations. The three were together when Coretta flew to Los Angeles after the assassination of Robert F. Kennedy to be with Ethel and shared "colorblind compassion." She has also been compared to Michelle Obama, the first African-American First Lady of the United States.  She is seen as being primarily responsible for the creation of the Martin Luther King, Jr. holiday. The holiday is now observed in all fifty states and has been since 2000. The first observance of the holiday after her death was commemorated with speeches, visits to the couple's tomb and the opening of a collection of Martin Luther King, Jr.'s papers. Her sister-in-law Christine King Farris said, "It is in her memory and her honor that we must carry this program on. This is as she would have it."  On February 7, 2017, Republicans in the Senate voted that Sen. Elizabeth Warren had violated Senate rule 19 during the debate on attorney general nominee Sen. Jeff Sessions, claiming that she impugned his character when she quoted statements made about Sessions by Coretta and Sen. Ted Kennedy. "Mr. Sessions has used the awesome power of his office to chill the free exercise of the vote by black citizens in the district he now seeks to serve as a federal judge. This simply cannot be allowed to happen," Coretta wrote in a 1986 letter to Sen. Strom Thurmond, which Warren attempted to read on the Senate floor. This action prohibited Warren from further participating in the debate on Sessions' nomination for United States Attorney General. Instead, she stepped into a nearby room and continued reading Coretta's letter while streaming live on the Internet.

Using a quote from the above article, answer the following question: What is the significance of this?
She is seen as being primarily responsible for the creation of the Martin Luther King, Jr. holiday.