Former president Donald Trump was the first to announce his run back in December, followed by Nikki Haley, Asa Hutchinson and Tim Scott as well as political outsiders Vivek Ramaswamy and Larry Elder.
On the Democrats' side, President Joe Biden filed his bid on April 25 - the same day as in 2019.
His was preceded by the bids of repeat presidential candidate and self-help author Marianne Williamson and Robert F. Kennedy Jr., a nephew of JFK who made headlines for his anti-vaccine stance.
So who will get the nomination?
Trump still dominates the field for Republicans (with Desantis actually down a little from April)...