First time a candidate receives 100 million votes?

[Sir Mohamed]

There is little doubt Biden in 2020 will surpass Obama's 2008 record of 69 million for most votes received by single candidate. What do you think, in which election will a candidate get 100 million votes?

I would assume some time in the middle of the century, perhaps as early as 2036 or so.

[Bootes Void]

Probably 2028 or 2032. Biden will easily get over 80 million votes perhaps if things reach 12 to 13 points as some district and national polls say, he may get up to 90 million

[Agonized-Statism]

Using some very rough math, it seems about 23% of the entire U.S. population voted Obama in 2008. A landslide on that level with 100 million voters for the winner would require a population of something like 435 million Americans. Most projections indicate that if turnout continues to be under 60%, this shouldn't be possible until after 2050. Since we're not exactly having a baby boom right now, nor are the conditions there to have one in the future, I'd say it becomes possible starting in 2068. I'm not a math guy, so someone can probably do this better than me.

Of course, if there are some New Deal-style sweeps by a dominant Democratic Party in the next few decades, it could be much sooner. But we're talking about maps that only a hack would make right now, and with high turnout to boot.

[𝕭𝖆𝖕𝖙𝖎𝖘𝖙𝖆 𝕸𝖎𝖓𝖔𝖑𝖆]

Using some very rough math, it seems about 23% of the entire U.S. population voted Obama in 2008. A landslide on that level with 100 million voters for the winner would require a population of something like 435 million Americans. Most projections indicate that if turnout continues to be under 60%, this shouldn't be possible until after 2050. Since we're not exactly having a baby boom right now, nor are the conditions there to have one in the future, I'd say it becomes possible starting in 2068. I'm not a math guy, so someone can probably do this better than me.

Of course, if there are some New Deal-style sweeps by a dominant Democratic Party in the next few decades, it could be much sooner. But we're talking about maps that only a hack would make right now, and with high turnout to boot.

You called me (lol not really)

Crunching the numbers it seems that Nixon in 1972 and Reagan in 1984 also took the votes of about 23% of the entire U.S. population despite winning much bigger landslides with not too dissimilar turnout, which is I suppose a product of the U.S. population being now older (so less underage kids).
With the population continuing to age, if turnout remains in the same ballpark, I can see someone having a great victory and taking the votes of 25% of the total population. If turnout (hopefully) swells, I can see the figure reaching 27%.
So we are talking of between 375 and 400 million people, which I suppose means the 2040s or 2050s.