The correct answer to this open question is the following.
Besides the president, the only nationally elected leader in the United States is the vice president.
Every four years, US citizens have presidential elections to vote for President and Vice president. The political parties organize a Convention where the delegates decided the formula for President and vice president. In the bipartisan political system of the United States, the two dominant parties have been the Democratic Party and the Republican Party.
Well, since one of the goals listed in the Preamble is to, "for a more perfect union," then perhaps it is that freedom of speech would help that goal of unifying the nation.
