The Iowa caucuses are well over a year away, but the New Jersey senator is working overtime to make an impression in Iowa and in other states that will be crucial to winning the Democratic presidential nomination in 2020. Booker has secured the keynote speaker role at the marquee fall Democratic Party fundraising banquet in Des Moines on Oct. 6. He'll also headline a Democratic fundraiser later in October in South Carolina, which holds the first primary in the South and is a key test of support among black voters.