This year, Democrats are playing defense in Senate races, with all seats most likely to be flipped currently held by Democrats. As the election approaches, many races tighten, putting the Republicans on the verge of getting more seats in the Senate than anticipated. The states that have shifted the most in the direction of Republican challengers are Wisconsin and Pennsylvania. Both feature similar races, with former businessmen challenging longtime incumbent Democratic senators in swing states. A few months ago, the two Republican challengers were trailing by more than 5 points, but now the races are very…
