A lawsuit challenging ballot rules in Ohio goes to trial on Monday — the latest in a series of voting rights cases brought in courts around the country. A group of labor and civil rights organizations are suing Ohio over a 2006 change to the state’s election code that requires all provisional ballots cast at the wrong voting precinct to be discarded. In Ohio, provisional ballots are used instead of traditional ballots when there are doubts about a voter’s eligibility because of missing registration or identification information. In most cases, a board of elections then reviews the ballots to determine if they should be counted. If the ballots are cast from the wrong precinct, they are discarded. In the 2008 election, 14,000 of Ohioan’s provisional ballots were discarded under the state’s election code.