Barack Obama, who twice won Wisconsin by large margins, will travel to the battleground state in the final weeks of the current midterm elections, seeking to boost Mandela Barnes, the young lieutenant governor looking to unseat the Republican Ron Johnson in a key US Senate contest.
Barnes would be the first Black senator from Wisconsin. He held early leads over Johnson but the Republican, a prominent figure on the GOP hard right, has surged back. This week, a Marquette University Law School poll showed Johnson in the lead.
