You're overselling your point. For example, in the 2016 presidential primaries, many of the candidates were using their first names preferentially: Hillary, Ber

You're overselling your point. For example, in the 2016 presidential primaries, many of the candidates were using their first names preferentially: Hillary, Bernie, Jeb, Rand, Carly. Of course, some candidates focused on their last names: Trump, O'Malley. And others used their full name: Ted Cruz, Ben Carson, Marco Rubio.