Watch: Obama-Linked Gospel Singer Performs At '04 GOP Convention, Sings About Bush

Sen. Barack Obama (D-IL) is under heavy fire over the decision to invite gospel singer Donnie McClurkin on a South Carolina campaign tour this weekend.

McClurkin has vowed to battle "the curse of homosexuality," and insists that sexuality can be changed by religious intervention. "If this is a war, we are willing to fight. Not a war of violence, but a war of purpose," he told the Washington Post in 2004 before performing at the Republican National Convention.

Below, watch McClurkin's performance at the convention, which took place on the final night just hours before President Bush's speech.

At one point, McClurkin even includes Bush in the lyrics of his song, singing in the final verse:

After you've done all you can, you just stand.

Don't give up, don't give in, you just stand.

Oh, Mr. President, tonight, you just stand.