The touch-screen machines replace the infamous punch-card system blamed for much of the problems that delayed the outcome of the 2000 election by five weeks before the US Supreme Court ended recounts.
Democrats believe the new machines could be a source of renewed electoral chaos since their failure to leave a paper trail would make a manual recount impossible.
A judge this week rejected a lawsuit demanding that printers be attached to the voting machines, which are used in 15 counties. The other 52 Florida counties use optical scan machines.
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