In spite of the diversity of interests in contemporary America, the presidency has proved to be a unifying influence and this explains why groups that would normally be at loggerheads are accommodated in two broad-based political parties.
Kitu ambacho viongozi wengi wa vyama hizi vya siasa wanachotakiwa kutambua ni kwamba unapokua raia wa nchini ya ughaibuni huruhusiwi kujihusisha na siasa ya vyama nje ya nchi na kufanya hivyo ni kuvunja sheria ya nchi za ugahaibuni.