So alleges Greg Palast here. I have no idea of Palast’s numbers are correct, and in particular whether he has lumped together both votes lost by the punch card machines and deliberate undervotes. I haven’t seen any undervote figures yet for this election. I’d appreciate hearing from others who have some data to evaluate this kind of claim.
UPDATE: See also this article from the Cleveland Plain Dealer, which includes the following:

Kerry also had an opportunity in Ohio to follow the Al Gore playbook and demand a recount of some 92,672 discounted votes for president, including 12,953 in Cuyahoga County.
Some of these votes may have been accidental double-votes in the presidential race, and some voters may have deliberately cast no vote for president. But many of these are likely uncounted votes that come up blank because of “hanging chads,” those infamous slips of paper on punch-card ballots.
But even though Ohio had 775,000 more voters Tuesday than it did four years ago, the number of discounted votes actually decreased slightly from 2000.
Blackwell’s spokesman, Carlo LoParo, attributed the drop to an aggressive voter-education campaign, as well as heightened attention to the problems with punch-card ballots that were exposed in the Florida election in 2000.

UPDATE II: Dan Tokaji persuasively answers “no” to this question on his Equal Vote Blog