and in fact, the preachers taking part in the pulpit freedom sunday are saying bring it on. they are challenging the irs to charge them with violating their tax exempt status as a religious institution. pastors say that churches belong on the front line of america's political frontier. >> to silence the pulpits means we're abandoning our call to be the moral voice of society. we're getting science be there, political leaders be there, no. it's not going to be the science of the lambs anymore. >> the movement is in direct challenge of the johnson amendment, nonprofit charities and churches from endorsing or supporting political candidates and the law was added to the tax code by then senator lynn done b johnson, some historians say as to silence them. and some say the law is unconstitutional. the irs has no business make