"It's pretty clear an indirect endorsement of Barack Obama — that's not something you're supposed to do according to the tax code," said Andrew Walsh, a professor at Trinity College who specializes in religion in politics.
The tax code bans churches from participating in or intervening in a political campaign. Violations can result in the loss of a church's tax exempt status.
The Obama campaign issued a statement in response to FOX News' inquiries about Wright's sermons.
"Senator Obama has said repeatedly that personal attacks such as this have no place in this campaign or our politics, whether they're offered from a platform at a rally or the pulpit of a church," said Bill Burton, a campaign spokesman.