WASHINGTON (Reuters) - Republican Senator Thom Tillis of North Carolina pulled even with his Democratic challenger, and in Michigan, the Republican candidate for a U.S. Senate seat cut into the Democratic incumbent's lead, Reuters/Ipsos polls showed on Tuesday.
There are about 12 competitive U.S. Senate races this year, 10 with vulnerable Republican incumbents and two with vulnerable Democrats. To have a majority in the Senate, Democrats need to pick up three seats if the party wins the White House, which gives the vice president a tie-breaking vote, and four if not.