(CNN) - Statewide absentee or early voting in the midterm elections kicked off Tuesday in the perennial swing state of Ohio.
Ohio joined Nebraska this week in allowing early voting, which is also underway in Georgia, South Dakota, Iowa, Vermont and Wyoming.
Roughly another two-dozen other states will allow early voting in October.
In Ohio's first year of early voting in 2006, 17 percent of voters took advantage of being able to vote 35 days before the election, according to the secretary of state's office. That number jumped to 30 percent in the 2008 election. Of the nearly 5.8 million votes cast two years ago, over 1.7 million were early votes.
- CNN Deputy Political Director Paul Steinhauser contributed to this report