- drive to the government office (cost of transit)
- typically during business hours (non-free for hourly employees)
- provide some backing ID (otherwise, what's to stop somebody claiming to be me/you). That might not be free.
Basically, anything that might disenfranchise a protected class of citizen is going to have a tough time getting bipartisan support. Look no further than state-wide voter ID programs - almost all originate in conservative, GOP-led states - and almost all are thinly veiled attempts to prevent poor and minorities from voting (those two groups are more likely to support Democrats).
- Washington and Oregon votes by mail for most/all elections (>95% mail ballot). No clue how they validate the sender, but you don't have to leave the house on election day.
- NC voters have to show an ID. But, just about any official-looking bill, bank statement, pay stub, or government document with voters name and address on it will do.
- Arizona similar to NC, but if no photo ID, must show 2 non-photo documents.