Barack Obama’s campaign has sued Ohio to block a measure which extends early voting for members of the military.

The action brought quick responses from Ohio Attorney General Mike DeWine and as many as 15 military groups.

DeWine told Fox News on Friday that he found the July 17 action by Obama campaign, the Democratic National Committee and the Ohio Democratic Party “quite shocking."

The tradition for allowing special circumstances for military personnel in voting dates back to the civil war, he said.

Read more on Newsmax.com: Obama Campaign Sues in Bid to Suppress Military Vote