A few years back an IRS ruling determined that a pastor could no longer state his position, even though he made it clear that it was his personal position and not the church's. Current interpretation is that pastors cannot use the pulpit to voice support or opposition of candidates.
Someone needs to tell the African-American clergy in Chicago, Detroit, NYC, etc.
This is not true of "every" black church or pastor, but think about Martin Luther King, Jesse Jackson, Al Sharpton, Malcom X (muslim), Louis Farakahn, the list goes on.