… It remains entirely possible that November’s results will leave the Senate divided again at 50–50, something that has not happened in consecutive elections since the Seventeenth Amendment established the direct election of senators more than a century ago. …
One of the most powerful trends in modern politics has been for each party to consolidate control of the Senate seats in the states it usually captures in the presidential election. That’s lowered the ceiling on the number of Senate seats each party can win. And that lowered ceiling, in turn, has diminished each side’s ability to maintain control of the Senate majority for any extended period.
The Senate is therefore frozen in the sense that neither side, in normal times, can seriously contest more than a handful of the seats held by the other party. Paradoxically, it’s unstable in the sense that the shrunken playing field leaves each side clinging to tiny majorities that are vulnerable to small shifts in voter attitudes in the very few states that remain consistently competitive. CONTINUED
Ronald Brownstein, The Atlantic
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