Fight fraud, but look at the real numbers to see where it may occur.
As to a couple of other claims, Philly cast 561,171 votes in the 2000 presidential -- 60% of registration or less. Many registrations may be phony, but no one is voting 100% of the registrants -- anywhere. Cite chapter and verse if you can name a specific precinct. The task is to be vigilant poll-watchers and be sure that no phony (or even expired/moved) registrants become phony voters. It will not happen by the millions, but even by a few thousands can tip a close race
There was a district in Philadelpia which saw more votes than eligible voters. Double voting, immigrants illegally voting, fraud, and undercount are all possible contributors. But it was just one precinct. But it also served as an example.