Aaron Blake: “Imagine when the dust settles on the 2026 midterm elections that Democrats haven’t gained a single Senate seat and are stuck at 47.”“Now imagine it’s a week after the election, and Democrats have won 55 seats — or even as many 57 — giving them the second-largest Senate majority for either party since 1981.”“The distance between those two outcomes isn’t nearly as large as you might think.”“With just five days left in the 2026 election, there is a huge margin of error in the battle for the Senate — with many races showing no clear leader in the polls.”