They tend not to vote for you when you don’t show up for them.
Via Washington Post:
Clinton claimed 40,000 to 80,000 Wisconsinites were turned away at the polls because of their skin color, age or “whatever excuse” in 2016. This matters because President Trump won Wisconsin by a narrow 22,748 votes. So this speech in Selma had an air of “what might have been.”
It was the first presidential election since the Supreme Court struck down a key part of the Voting Rights Act, Clinton noted. This “made a difference in Wisconsin,” she said. Total voter registration declined in Georgia once this law was gone, she added.
Some studies show that voter ID laws favored by Republicans have a deterrent effect, especially on minority voters, who tend to vote for Democrats. Wisconsin enacted a voter ID law before the 2016 election. A study from the University of Wisconsin found that the new requirements deterred thousands of eligible voters in two counties from casting ballots.
Nevertheless, Clinton made several factual errors, offered questionable claims about a couple of studies, and ended up giving a misleading assessment of her loss.