money is not the only factor.
may not be the most money, but it's the most effective use of money.
PA roads were littered with trump signs because of people being paid to litter our streets with them. for months.
people are, sadly, very easily influenced. companies wouldn't pour so much into advertising, in general, if it didn't have such an effective influence
[0] https://www.usnews.com/opinion/articles/2024-11-15/trump-har...
Most campaigns stretch the truth a bit here and there, but from what I personally saw and from what I read from other states where the campaigning was more intense generally the Harris campaign did not stretch nearly as far as the Trump campaign.
I'd expect that this let the Tump campaign get more out of a given amount of spending than the Harris campaign could.
"Absolutely, money does have a measurable impact on political outcomes"
https://www.investopedia.com/surprising-thing-billionaires-s...
https://www.opensecrets.org/elections-overview/winning-vs-sp...
Furthermore, in a country with somewhat free media you would always expect populist candidates to outperform with a given budget, because their platform is much better aligned with media interest; mass media does not want boring budget plans or quaint reforms-- rage-bait sells way better and nets populists tons of "free" online presence.