The sponsoring paper named by the awards is the South Florida Sun-Sentinel, although I think this is a bigger boost for the site Cartoon Movement. When you combine the Herblock Prize win that Matt Bors recently enjoyed and his Pulitzer finalist status with McMillan's new honor, it's hard to deny the obvious traction being accrued to their shared platform through such achievements.
McMillan will receive her award on May 24 during a ceremony in Washington, DC.