There are problems in these times
By 
There’s a widespread perception — shared by both Democrats and Republicans — that GOP voters are far more motivated by a desire to control the judiciary than Democrats. It’s the reason why Senate Majority Leader Mitch McConnell claimed, somewhat hyperbolically, in a 2019 address to the Federalist Society that “the single biggest issue that brought nine out of 10 Republican voters home to Donald Trump … was the Supreme Court.”
It’s also the reason President Trump bragged, falsely, that he’s appointed “more than 300 federal judges” in his speech at the Republican National Convention (in reality, the number is closer to 200), while Democrats barely mentioned the courts at all at their convention the previous week.
But a recent poll by the Pew Research Center suggests that this perception that judicial politics favor Republicans is outdated. Pew asked Democratic and Republican voters which issues are “very important” to their vote in the 2020 presidential election. In their poll, 66 percent of Democrats and only 61 percent of Republicans named “Supreme Court appointments.”
By comparison, a similar poll from Pew taken in the summer before the 2016 election found that Trump supporters were 8 points more likely to view Supreme Court appointments as “very important,” as compared to Clinton voters.
The complacency of Democratic elites about the Supreme Court remains genuinely baffling to me, and they’re now (at least in their rhetoric) behind their own voters.
Of course, this is all too late:
The biggest one is Senate malapportionment. In 2016, when Republicans blocked Obama Supreme Court nominee Merrick Garland, Democratic senators represented about 20 million more people than their Republican counterparts. Republicans owed their majority to the fact that small red states like Wyoming receive exactly as many senators as large blue states like California — even though California has 68 times as many people as Wyoming.
But Democrats do bear some responsibility for the GOP’s dominance of the Supreme Court. In the 2014 midterms, turnout was just 36.3 percent — the lowest level of voter turnout in 72 years. Republicans picked up nine Senate seats in that election, and with them, the power to keep Garland off the Supreme Court.
As my colleague Ezra Klein wrote shortly after Kennedy’s retirement, “I remember covering the 2014 election, and the narrative was that it just didn’t matter. Barack Obama had won reelection in 2012 and gotten filibustered on virtually everything he tried.” But the 2014 election mattered a great deal: “Turns out the Supreme Court was the point.”
I would emphasize the structural issues over the individual voters here: one of the many problems with the gridlock created by the incompatibility of a high-veto-point system and high partisan polarization is that it will demobilize voters of the in-party. And it’s also unquestionably true that Democratic elites have not invested anything like the resources around the federal judiciary that Republican elites have.