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hook for some of the statements that were made. so i'm sure it's anxiety inducing for a lot of them and on top of everything else that they're watching politically, which if you look at any of the national polls that have come out lately, even though his base has remained solid, you see incremental degradation with the general electorate. losing to joe biden. i'm sure some republican is going to come along and make that point in the primary. >> we've seen very bad weeks for him before and he's managed to publicly at least in the court of public opinion he's been able to skirt around ...

>> reporter: but the perpetrator's dna didn't match any database. >> so we are playing the fact we have this technology and we catch everybody, but in real life the technology had not been invented yet. >> reporter: then the science of genetic genealogy emerged. investigators granted cnn an exclusive interview about the procedure, first used on the state level in california to identify the golden state serial killer. >> we use it as an investigative tool to reverse engineer family trees and figure out who he was. >> reporter: investigators compared dna on the stalker's letters with dna in publ...