Kamala Harris

The Iowa caucuses are still nine months away, and with at least 20 Democrats either considering a run or officially declared, many of them are looking for ways to stand out in the crowded field. One tried-and-true way: show up in voters' homes.

Updated at 9:10 a.m. ET

California Sen. Kamala Harris is running for president in 2020. The first-term Democratic senator made the announcement on ABC's Good Morning America Monday morning.

"I love my country, and this is a moment in time that I feel a sense of responsibility to fight for the best of who we are," Harris said.