A Touchy Debate Over Voting With the presidential election less than six weeks away, activists and security experts are ratcheting up concern over the use of touch-screen machines to cast votes.  &lt;FONT face="verdana,MS Sans Serif,arial,helvetica" size="-2"\ color="#666666"&gt;&lt;B&gt;-washingtonpost.com&lt;/B&gt;&lt;/FONT&gt;