While serving as mere background and description in places, the majority opinion offers some statements that, I imagine, lower courts might find useful in the event future disputes arise relating to presidential elections. From the opinion:

. . . Presiding over the January 6 certification proceeding at which Members of Congress count the electoral votes is a constitutional and statutory duty of the Vice President. Art. II, §1, cl. 3; Amdt. 12; 3 U. S. C. §15. . . .

. . . When the Vice President presides over the January 6 certification proceeding, he does so in his capacity as President of the Senate. Ibid. Despite the Vice President’s expansive role of advising and assisting the President within the Executive Branch, the Vice President’s Article I responsibility of “presiding over the Senate” is “not an ‘executive branch’ function.” Memorandum from L. Silberman, Deputy Atty. Gen., to R. Burress, Office of the President, Re: Conflict of Interest Problems Arising Out of the President’s Nomination of Nelson A. Rockefeller To Be Vice President Under the Twenty-Fifth Amendment to the Constitution 2 (Aug. 28, 1974). With respect to the certification proceeding in particular, Congress has legislated extensively to define the Vice President’s role in the counting of the electoral votes, see, e.g., 3 U. S. C. §15, and the President plays no direct constitutional or statutory role in that process. So the Government may argue that consideration of the President’s communications with the Vice President concerning the certification proceeding does not pose “dangers of intrusion on the authority and functions of the Executive Branch.” Fitzgerald, 457 U. S., at 754; see supra, at 14. . . .

(It’s worth noting this framing of the Vice President’s role is consistent with the federal district court in favor of Mike Pence last year. And it does call to mind these remarks from then-Vice Presidential candidate Joe Biden in 2008, “Vice President Cheney has been the most dangerous vice president we’ve had probably in American history. The idea he doesn’t realize that Article I of the Constitution defines the role of the vice president of the United States, that’s the Executive Branch. He works in the Executive Branch. He should understand that. Everyone should understand that. . . . The only authority the vice president has from the legislative standpoint is the vote, only when there is a tie vote. He has no authority relative to the Congress. The idea he’s part of the Legislative Branch is a bizarre notion invented by Cheney to aggrandize the power of a unitary executive and look where it has gotten us.”)

Indeed, the Constitution commits to the States the power to “appoint” Presidential electors “in such Manner as the Legislature thereof may direct.” Art. II, §1, cl. 2; see Burroughs v. United States, 290 U. S. 534, 544 (1934). “Article II, §1’s appointments power,” we have said, “gives the States far-reaching authority over presidential electors, absent some other constitutional constraint.” Chiafalo v. Washington, 591 U. S. 578, 588–589 (2020). By contrast, the Federal Government’s role in appointing electors is limited. Congress may prescribe when the state-appointed electors shall meet, and it counts and certifies their votes. Art. II, §1, cls. 3, 4. The President, meanwhile, plays no direct role in the process, nor does he have authority to control the state officials who do. And the Framers, wary of “cabal, intrigue and corruption,” specifically excluded from service as electors “all those who from situation might be suspected of too great devotion to the president in office.” The Federalist No. 68, at 459 (A. Hamilton); see Art. II, §1, cl. 2.