Improper ID is valid to prove voter impersonation. I cannot vote as myself and return to vote as Tom Bombadil or Conrad Hilton unless I have a photo ID that had those names with my photo.
There is not a lot of voter fraud, but what there is, mostly involves fraudulent absentee ballots.
Here in Florida, they arrested a Cuban woman named Deisy with a whole bunch of ballots with the names of Assisted living residents on them. They were found to be improperly marked. They also found ONE (1) ONE Canadian who voted illegally using his own name.
In Pennsylvania, an investigation found NO cases of voter impersonation.