That is the goal, and it can only be achieved with a landslide. Of course electing Biden/Harris is critically important, but the stakes in this election are much larger than that alone, which is why "overconfidence" is not a relevant concern. There is no political target reachable that can warrant slackening off during this election, no level of support for Biden we can possibly attain that can ever be "enough". It's like the psychology involved in setting a fund raising goal, if you hit it early then you simply raise it. A budding authoritarian movement must be smashed, and nothing we can achieve during one election cycle can finish that job, it's just a question of how much damage to "Trumpism" we can realize this time around.
We accomplish this in two ways. One, by firing up our own side to vanquish any and all opposition, both up and down the ballot. Two, by depressing the hell out of the other side, causing them to stay home on Election Day. Let it be a sign of our strength, and a source of great pride, to overcome every obstacle to voting. Leave it to our opposition to wonder if it will make any difference if they come out to vote
It is setting our sites too low to look at early voting numbers and hope that Democrats are banking enough votes in advance to overcome a probable Republican advantage on Election Day itself. Where is it written in stone that significantly fewer Democrats will turn out to vote on Election Day than will Republicans? It is within our power to effect that. We are successfully executing phase one of this election, by decisively winning the early vote. Next comes phase two. If we can surge on Election Day also we can have the major landslide that we dream of, but to do so we must frame what is at stake correctly. I repeat, it's about much more than just electing Biden/Harris.
For anyone concerned about a woman's right to choose, the answer is: VOTE
For anyone concerned about runaway climate change, the answer is: VOTE
For anyone concerned about back breaking student debt, the answer is: VOTE
For anyone worried about affordable health care and their preexisting conditions: VOTE
For anyone worried about an out of control Dept. Of Justice persecuting political enemies: VOTE
For anyone who believes the U.S should stand with other world democracies rather than tyrants: VOTE
For anyone who thinks Black Lives Matter: VOTE
For anyone who cares about growing poverty, while massive wealth keeps flowing to the top: VOTE
For anyone who believes in fighting the Covid-19 pandemic with everything we've got: VOTE
For all those who stand with the Dreamers: VOTE
For all who believe the United States should not rip children away from their parents: VOTE
For all those who believe that a full time job should earn a living wage: VOTE
For all those who think Covid-19 Relief funds should go to average workers and Main Street, rather than billionaires and Wall Street: VOTE
For all those who feel that dividing Americans weakens America: VOTE
For all those who know that White Nationalists, Neo-Nazis, extremist militias and Klansmen are the real threat to our nation's security, not Antifa demonstrators: VOTE
For all those who feel flooding our streets with legal semi-automatic assault style weapons makes us less, not more, safe: VOTE
For all those who believe that lying to the public is not a virtue, and being a public servant is not a vice: VOTE
For all those who believe that Voter Suppression must finally be ended, once and for all: VOTE
Of course the list of reasons to vote this year is virtually limitless, so I'll rest here for the moment. But this is the final point that needs to be driven home, now.
For all of those who remain skeptical about whether voting ever makes much of a real difference, who think the system can not change, here is the chance they have been waiting for to finally find out. This is the year many fellow skeptics have already decided this time they too will vote. This year can be the experiment for what can change if two thirds of Americans actually vote. This is that moment: VOTE!