Senate races are tightening across the country in frenzied battle for majority

The battle for the Senate majority is going down to the wire as a series of races across the country tighten in the days before the election, a process that is alternatively giving hope while also panicking partisans in both parties.

Democrats have their eyes on Wisconsin, where a new poll from CNN found Sen. Ron Johnson (R-Wis.) clinging to just a 1-point lead over Democratic Lt. Gov. Mandela Barnes.

Johnson had been seen as building a more significant lead, and the closeness of the race gave Democrats new hope...