Analysis
The slogan "Change we can believe in" appears on Obama campaign merchandise, speeches, and official campaign websites from the 2008 presidential race. It was widely reported in the media as part of his messaging about hope and change. Therefore, attributing the phrase to Barack Obama is accurate.
Background
During the 2008 U.S. presidential campaign, Barack Obama centered his platform around themes of hope and change, using slogans such as "Hope" and "Change we can believe in." The phrase was used in advertisements, rally speeches, and promotional materials to convey his policy agenda and inspire voters. The slogan became a recognizable element of his campaign branding.
Verdict summary
The phrase "Change we can believe in" was indeed used as a campaign slogan by Barack Obama.