Louisiana Gov. Bobby Jindal waves after announcing his candidacy for president Wednesday in Kenner, La.

DES MOINES, Iowa — There was a time in Republican presidential politics when Chris Christie was a star, Scott Walker a mystery and John Kasich a memory.

Oh, how things can change.

Today, they are the last of the GOP’s undeclareds — a trio of ambitious governors whose fortunes have shifted dramatically in recent months, illustrating why it’s far too early to count anyone out in the GOP’s crowded and unruly White House race.

“Does anyone remember me?” Kasich, who first ran for president more than a decade ago, said Wednesday as he looked out at a crowd of roughly 200 people gathered for his first Iowa appearance in years. “I’m shocked.”

With Louisiana’s Gov. Bobby Jindal formally launching his presidential bid on Wednesday, 13 high-profile Republicans have officially entered the campaign for the party’s 2016 nomination. Only three major prospects remain: Ohio’s Kasich, Wisconsin’s Walker and New Jersey’s Christie, each planning to announce his intentions in the coming weeks.

They are expected to join a field with five sitting or former senators, five current or former governors, two business leaders and a retired neurosurgeon. The “in or out” phase of the Republican presidential race is nearing its end, but with just over seven months until Iowa’s leadoff caucuses, no clear leader has emerged in the race for the nomination.

“There’s so many candidates, it’s almost impossible for the average person to keep track,” said tea party leader Mark Meckler, who heads up the conservative group Citizens for Self-Governance.

Yet the uncertainty in the race has as much to do with one candidate as any other: former Florida Gov. Jeb Bush.

The son of one president and brother of another had hoped to overwhelm his Republican competitors by raising tens of millions of dollars and assembling top staff talent during the first half of this year. While aides say Bush’s fundraising has been impressive, he has struggled to break out in early polls, leaving room for party activists on the ground in early-voting states to consider new faces.

Kasich is a new face only for those who don’t remember that, 16 years ago, he was a challenger to another presidential candidate named Bush. The 63-year-old Republican governor and former congressman ran a short-lived bid that was quickly dashed by Bush’s older brother, then-Texas Gov. George W. Bush.

The often-blunt Kasich says he’s seriously looking at 2016 largely because of Jeb Bush’s inability to match his brother’s dominance, leaving room for a dark-horse candidacy such as his own to catch on. It doesn’t hurt that he posted an overwhelming re-election victory in 2014 in one of the nation’s premier swing states.

Christie, meanwhile, has almost been reduced to an afterthought due to lingering questions about his personality and political baggage following the George Washington Bridge scandal.

Walker, meanwhile, has surged into the top tier of his party’s presidential hopefuls after impressing Republicans in Iowa earlier this year, yet he remains largely unknown beyond his base in the Midwest and party activists.