And yet, no politician campaigns for that because it would actually resolve the issue.
A politician who campaigns for that will be beset upon by the right wing as it heaves into a fit over they're spying on us, they're trying to track us. Because in actually solving the nonexistent problem, they threaten the true reason for the problem being posed.
But you decided to take only the slice of the problem that fit your talking point, and that is the real problem.
My "talking point", such as it is, is that one political party is actively disinterested in democracy (while the other is more or less ambivalent), and that nobody in that actively-disinterested party is going to let the ambivalent party make this happen. Because it empowers them for it to not happen. It's not rocket science.
Because there are barriers, and expensive fees for many, intentional or not. The article above gives a couple stories of the issues people face trying to get ID for voting.
Until everyone can automatically and without cost obtain an ID for voting, these are new versions of poll taxes.