If the Philippines got statehood in 1960, they'd have over 20 million people, 27 million if we assume OTL fertility rates. It would be at least a few million more than the next most populous state.
You'd also definitely be having a larger House of Representatives too. The Philippines would have over 50 representatives and easily be the most populous state, even if many people (far more than OTL) leave to go to California or elsewhere. This would increase to possibility up to 80 congressional districts which are all Filipino. Dividing the Philippines into separate states of course adds to their power in Congress by giving them more senators.
In the end, if the Philippines are a state, then you'd basically need to rename the nation the "United States of America and the Philippines". USAP. Depending on the fertility rate, you'd have the Americans anywhere from 1/4 to 1/6 Filipino, the majority of them living in the Philippines and natively speaking non-English languages. And it goes without saying the islands will be a money sink since the Filipino congressional delegation will naturally vote as much money as they can to the island which is needed to improve the living conditions which at the time of statehood are abysmal compared to the rest of the country. That won't go over well with voters in the rest of the USA(P).
Personally, I think you'd need some sort of special status for the Philippines that would somehow satisfy their need to be an independent nation yet also satisfy the goal of tying them to the United States in some legal manner and not just through economic factors.