Why does Pennsylvania win the world? 1. Number of electoral votes Pennsylvania has 19 electoral votes and is one of the large states in the Electoral College. In the presidential election, a candidate needs to obtain at least 270 electoral votes to be elected, so Pennsylvania's electoral votes are crucial to either party. 2. Swing state status Pennsylvania is regarded as a key swing state, and its voters may support different parties in different elections. For example, in 2016, Pennsylvania supported Republican candidate Donald Trump; in 2020, it supported Democratic candidate Joe Biden. This uncertainty makes Pennsylvania a focus of competition between the two parties.