Hard how? It's not the best political message to run on. It might help raise minority turnout some by people being pissed their vote is being suppressed, but overall polls show they'd be better off ignoring suppression and instead promoting election day holiday, move election day to weekend, or vote by mail.
Why not do all of these? A Dem message of Electoral Reform, that encompasses voter suppression, gerrymandering, and a national holiday for Election Day. The beauty of the multiple points is that the GOP can't argue against it and appear reasonable. They can argue for voter ID laws on its own, but how do they argue against a National Holiday and not appear dicks?
The Dems need to own voter rights and electoral integrity. And, with Russia's influence on Trump and the GOP, it shouldn't be hard to argue to the reasonable section of the electorate that the GOP can't be trusted on such things.