Niche Voting Robert talks to Steven Schier (as in "sheer"), author of "By Invitation Only: The Rise of Exclusive Politics in the United States." Schier's book is about how low voter turn out is now, compared with the late 19th and early 20th centuries. At that time, political party machines helped turn out the vote." Now politics in the US have shifted from the mobilization of the general population, to "activation," the political version of "niche marketing" by targeting certain portions of the public to become involved in politics. (7:00) "By Invitation Only," by Steven Schier is due for publication by University of Pittsburgh Press, 3/1/00.