This is not how it actually works. Small states have outsized representation in the electoral college, as compared to their population. Wisconsin has a population of 5.8 million and 10 electoral votes. Texas has a population of 27.0 million and 38 electoral votes. If you won 5 states the same size as Wisconsin, it would represent a population of 29.0 million and you'd get 50 electoral votes. Texas has a population that is 7% smaller than 5 Wisconsins, but is allocated 24% fewer electoral votes than 5 Wisconsins would have.
The reason it works this way is because the number of electors is the number of Representatives that state gets in the house (which is allocated by population) plus the amount in the Senate (where every state gets the same number -- 2). It would be possible to adjust the system to make population differences have less impact. The simplest way would be to do it by just having the number of electors be the same as number of Representatives. But as it stands today you have a different impact in the Electoral College depending on the size state you are voting in.