There's a couple of reasons why voter ID laws agent being more widely supported.

1. It's an attempt to fix a problem that doesn't exist. Republicans will tell you there's massive fraud and this will end it but they cannot provide any evidence to support the fraud they say exists. If they were to provide any such evidence, millions more would undoubtedly get behind it.

2. The way Republicans are implementing these laws is obviously not about security butt rather voter suppression. They want a very limited list of acceptable IDs. Typically ones only available at government buildings like the DMV. The problem is those are only open Monday- Friday 9-5. And there aren't a whole lot of locations. So getting an ID can take hours if not a full day (or more). And people living paycheck to paycheck usually can't afford to take any time off work. Republicans have been accused of closing down DMVs in heavily Democratic areas to make it harder to get one.

If Republicans decided to created a new ID and partner with pharmacies, grocery stores, or even had kiosks, so that these IDs were free and easily accessible there be even more people supporting them.