So the 2% party, if he tries really hard.
With few exceptions,[1] the U.S. system has two major parties which have won, on average, 98% of all state and federal seats.[2] According to Duverger's law two main political parties emerge in political systems with plurality voting in single-member districts. In this case, votes for minor parties can potentially be regarded splitting votes away from the most similar major party.[2][3]