In order to have an impact on election results, wouldn't you need a very large number of people without ID's standing in line all day long, for hours, to vote m

In order to have an impact on election results, wouldn't you need a very large number of people without ID's standing in line all day long, for hours, to vote multiple times at different precincts? And they would have to give a valid name of a registered voter who had not showed up yet, or the pollworkers would realize that the same person was trying to vote twice. Or you could only impersonate voters who voted by mail (thereby voting twice in the same name). Sure, you can come up with examples where a very small number of votes determined an election outcome. But for the vast majority of important contests -- and especially for state and federal level -- it does not seem feasible to round up enough thousands of people to cast enough fraudulent ballots to affect the election outcome.