With Ron Paul as president the USA's foreign policy would be like Sweden's. Does Sweden bomb and attack other countries? Does it assassinate elected leaders. No, you talk to people, travel and trade; that's what Ron Paul wants to do.
The legacy of Reagan and others are less than stellar, with criminal operations in foreign countries (Beirut), supporting terrorist groups (Contras), extremist religious fanatics(Afghanistan), dictators (Saddam), et al.
But still. USA is the biggest nation in the world, the most powerful country, and could and should be a beacon for democracy and world peace.
It should be a leader, obviously not through non-democratic methods, and lead the world, make it better.
Sweden, only 9 million, cannot.
USA, biggest economy in the world, and the major nation, can.
It is that simple.
UN, while not perfect, has its main body located in USA for a reason. It is the creation of USA, and USA has to be the major engine, powering UN.