Do tell....
Here's a start. An older article but not much has changed since then, due to Republican supermajority:
Since 2013, state and local officials have implemented voting reforms that resulted in unequal access to early voting in Indiana, which appears to have affected the largest Democratic strongholds in the state, an IndyStar investigation has found.
www.indystar.com
Note for the record that the Indianapolis Star is a pretty right-leaning publication, so I was surprised to see this story there. The bottom line is that in Indianapolis, where many of the Democrats are concentrated, polling places are harder to access and satellite locations for early voting are nearly impossible to get to if they exist at all. I'm in one of the donut counties surrounding Marion, and I have better access to satellite voting even if it isn't ideal (long lines every time I've done it). Many of the most rural counties (strongly Republican) have enough satellite locations that you can drive up, park easily, go in and vote right away, and leave in 5 minutes.
Indiana is also notorious for trying to scrub the voting roles, even without notice to those being removed. I believe one effort to do so was overturned by the courts. In Indiana (and many other states) there are structural disadvantages to democratic voters, in the form of access to polling sites, shorter hours making it hard for shift workers or those with kids, and other things. These disproportionately impact democrats.
But, the larger story is we need to be planning for every citizen to be able to cast their ballot in November, amid a pandemic which means we can't be planning for business as usual. We don't know what exactly it will be like this fall, but it is nearly a certainty that at least some locations will be under new restrictions / lockdowns as hotspots flare up. We have to plan for worst case and hope for the best case. For sure, universal absentee ballot by mail should be an option for those who choose to use it, as just one element of the solution.