A pejorative used by extreme political conservatives to pander to their extreme religious conservative base. The label includes anyone and any group who dissents against the extreme political conservative agenda in regards to social and culture issues.
People covered by the label seem to include the entire Democratic party, those who support separation of church and state, those who support real religious liberty, those who support reproductive choice, those who work to lessen poverty, those who work for better world understanding, those who support sane enviromental protections, and those who trust science as a tool for solving problems or answering questions.
Since the label is political it can include believers, atheists, agnostics, Freethinkers, liberals, and progressives.
"I think that was an injudicious thing to say, but that the secular left has behaved imperialistically--there's no other word for it. They have subverted the democratic process by taking their issues to the judiciary. What the so-called religious right has done has taken their petition and their concerns into the democratic process, into the public square. They organize and they try to affect legislation, as opposed to being the subverted process of democracy which is what the secular left does." -- Mary Matalin, conservative commentator, on May 8th 2005 "Meet the Press".