An alleged racial slur against Democratic presidential hopeful Barack Obama has sparked criticism against a southern Idaho radio station, with some in the community calling for the show to be canceled.

Obama supporters allege a conservative talk show host on Rupert, Idaho-based KBAR AM this week referred to the Illinois senator as the "black Negroid Barack Hussein Obama."

Others also say a guest on Zeb Bell's show called Obama's mother "trailer trash" who has a fixation on black men. Obama's mother is white. His father is from Kenya. Bell, who has hosted his show on KBAR since 2000, denied making any racist comments but acknowledged a friend and guest, Frosty Wooldridge, did make inappropriate remarks on the air.