There are more Trump voters in California than Texas, more Biden voters in Texas than New York, more Trump voters in New York than Ohio, more Biden voters in Ohio than Massachusetts, more Trump voters in Massachusetts than Mississippi, and more Biden voters in Mississippi than Vermont.
XKCD comic with election map, and entire quote from alt text
and unfortunately 70% of the US population resides within 15 states, meaning that they only have 30% representation in the Senate.