Where are the Libertarians?

Here David Boaz asks, Where are the Libertarians in the media and politics? His question is prompted by a gallup poll showing a sizeable chunk of Americans are neither conservative nor (left) liberal. And according to 2004 exit polls, 45 million Americans don't want the government used to promote "traditional values" or do things best "left to individuals and business".
There is no reserach I am aware that has bothered to ask such questions here.