Typically, they gather at their local state houses and award their electoral votes, in most cases to whoever gathered the most popular votes in their state.
A savvy legislator, Hirono spent 13 years in the Hawaii statehouse, eight years as the state's lieutenant governor and six years in the U.S. House before winning her U.S. Senate race in 2012.
And there - what is going to happen is that they will take her coffin from the houses of Parliament by a state gun carriage over to Westminster Abbey, which is, of course, just across the street.
It occurred to me only that their presence was magical, and that seeing them on the grassy wastelands around my council estate, as I stumbled home from parties and nightclubs, was everything I loved about being alive.
Not everyone, though - an angry and vocal minority resented what they viewed as intrusions on their personal liberty, including a group that marched on the state capitol with guns hanging effigies of her.
Top South California officials including senator Lindsey Graham and governor Nikki Haley had called for the Confederate flag to come down at the State Capitol in the wake of the deadly shooting in a historic black church.
In conservative Tennessee, protesters gathered at the state Capitol building to demand more gun laws after six people were killed at a religious elementary school last month.
And Florida Senator Bill Nelson dropped to the floor of the Capitol and did 46 push-ups after losing a Stanley Cup wager to Illinois Senator Dick Durbin.
Conservative Oregonians say the non-binding votes in the Central and Eastern counties are as much about sending a message to lawmakers in the state capitol.