Yes, Puerto Ricans in the United States wield significant political capital despite their non-inclusion with the 50 states of the union, because they all have the ability to access the same services that the rest of Americans can access. In fact, the rate of Puerto Ricans that receive disability payments is one of the highest rates in the nation.
Puerto Rico is not a state in the union, but it most probably should be. However, the Puerto Rican community as a whole does wield a lot of political power in terms of its voice and its access to benefits and its solidarity with American Puerto Ricans and other people in the Hispanic world who live here and may be citizens.
At the present moment Puerto Ricans are mostly isolated into specific areas of the country, and this isolation prevents true penetration of the American political culture. In the areas they live they wield significant power and leverage, but there are too few areas populated by them for political capital on a national scale.
Puerto Rico is often a forgotten afterthought in American politics. The island doesn't have official representation in Congress. Less than 5 million people live there. Puerto Rico does have electoral votes when choosing a president, but the territory's electoral presence has never truly mattered on a national stage. Puerto Ricans wield a significant cultural presence, but not much political capital.
First of all the people of Puerto Rico would cause a huge burden on the rest of the nation because the population is so poor there. It also would cost alot of money to help it become a state. The people of Puerto Rico are already US citizens. They enjoy the protection of the American military (and are subject to conscription in the event of war), and don't have to pay federal income tax