Story highlights Some Arizona lawmakers and activists are accusing local officials of voter suppression tactics

The Arizona Democratic Party has asked voters who had a difficult time voting to complete a form online explaining their challenges

Washington (CNN) Vermont Sen. Bernie Sanders said Wednesday that it "is a disgrace" that some Arizona voters waited in line for five hours to vote because of too few polling stations.

"In the United States of America, democracy is the foundation of our way of life," the Democratic presidential hopeful said. "And what happened in Arizona is a disgrace. I hope that every state in this country learns from that and learns how to put together a proper election where people can come in and vote in a timely manner and go back to work."

Sanders said during a news conference a supporter emailed his campaign complaining about the long waits.

"Whatever the cost of that problem is people in the United States of America shouldn't have to wait five hours in order to vote," he said. "We do not know how many thousands of people who wanted to vote in Arizona did not vote."

Liberal activists are also demanding an investigation into what they see as possible voter suppression as a result of Maricopa County officials' decision to reduce the number of polling stations as a cost-saving measure.

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