In states with Senate races in 2016, there were 1.8 million more votes in the presidential race than in the Senate races. Across the 30 large & contested states I checked in 2016, there were 6.3 million more votes cast in POTUS than in House races. By itself, this is not unusual. https://twitter.com/HeyTammyBruce/status/1325472807749373952

Consider Pennsylvania. In 2016, there were 6,166,938 votes cast in the presidential race, 6,051,856 in the Senate race (-115,082), 5,741,751 (-425,187) in House races. And this year, there was no PA Senate race. So a 6-figure number of POTUS-only ballots is unremarkable.

Overvotes in presidential races, like ticket-splitting, is an extremely longstanding & well-known pattern in American elections. Anybody telling you this is new just hasn't looked at elections before 2020.

It is not unusual to see people show up & only vote for a presidential candidate, for the same reasons why it is not unusual that many people who vote in presidential years do not show up during midterm elections. And with turnout through the roof in 2020, we should expect more.

Now, if I was looking for fraudulent ballots, would I look harder at presidential overvote ballots? Sure. Easier to produce a ballot with just one vote on it. But overvoting alone is not proof of anything.