The ghosts of dead presidents will be coming soon to Houston movie theaters.

The appearance of former presidents John F. Kennedy, Lyndon Johnson, Richard Nixon, Dwight D. Eisenhower and Ronald Reagan before summer blockbusters comes courtesy of a new campaign by the American Clean Skies Foundation, a natural gas advocacy group.

In ads running in Landmark Theaters in Houston, New York City, Los Angeles and Washington, D.C., the group uses old footage of the presidents giving historic speeches at pivotal moments to highlight President Barack Obama's decision to tout a 100-year supply of natural gas during his 2012 State of the Union speech.