Donald Trump scored a victory Tuesday night in Ohio, where GOP Senate nominee J.D. Vance won the Republican primary largely on the back of the former president’s support.

The nominating contest, which was widely viewed as a test of Trump’s power, marked an early win in his effort to solidify his status as a Republican kingmaker now that he’s out of office and the 2022 primaries are underway in full force.

Should Trump enjoy more successes after Vance’s win, his power within the Republican Party will only swell – a big boost for him as he mulls running again for the White House in 2024. But if other endorsees struggle and Vance is a one-off, it could hurt Trump’s brand with grassroots voters.

Here are five primaries where Trump’s endorsement is on the line.

West Virginia’s 2nd Congressional District (May 10)

The next test Trump will face is in West Virginia, where redistricting lumped the former president’s preferred candidate, Rep. Alex Mooney (R), in the same district with David McKinley (R).

The race represents a battle between the GOP’s two flanks: Mooney is a staunchly conservative member of the hardline House Freedom Caucus, and McKinley is widely viewed as a traditional conservative.

The race has become personal, with Mooney highlighting McKinley’s votes for a bipartisan infrastructure bill and the formation of a bipartisan committee to investigate the Jan. 6 attacks. McKinley has shot back by highlighting the fact that Mooney moved from Maryland shortly before his successful 2014 congressional bid.

Trump endorsed Mooney in November, with Mooney specifically saying the support would help propel him to the GOP nomination.

“I am honored to receive President Trump’s endorsement,” Mooney said in a statement at the time. “I am a proud America First conservative and will do whatever I can to carry on the President’s legacy of fighting for election integrity, defeating socialism, and supporting the Second Amendment in Congress. West Virginians are proud Trump Republicans, and I know the President’s endorsement ensures victory.”

Trump held a tele-rally with Mooney in Tuesday, though he has not put much money or other emphasis behind his endorsement besides that.

Meanwhile, McKinley is running on a bring-home-the-bacon message and is being supported by Sen. Joe Manchin (D-W.Va.). Manchin is the rare Democrat who is able to get elected in deep Trump country and appeared in a 30-second clip last week saying, “David McKinley is all about us.”

Next week’s contest could serve as a gauge of Trump’s power in less prominent races and how much an endorsement needs to be backed up by subsequent involvement for his endorsees to emerge victorious.

Pennsylvania’s GOP Senate primary (May 17)

Pennsylvania’s Senate GOP primary is the next race with a national profile in which Trump has endorsed.

After Sean Parnell, Trump’s original endorsee in the primary, dropped out last year after a lost custody battle, the former president in April endorsed Mehmet Oz, the celebrity cardiothoracic surgeon.

Oz and former hedge fund manager David McCormick are running neck and neck at the top of the polls, and the Trump endorsement has not yet helped Oz break away.

Oz, who Trump said he endorsed in part because of his familiarity with voters from his longtime talk show, faces a number of attacks from the Republican grassroots, mainly over his recent residence in New Jersey and past stances on issues like abortion and gun rights that run contrary to GOP orthodoxy.

Meanwhile, McCormick, who also lived in Connecticut until recently, is casting himself as the true Pennsylvanian candidate and using much of his personal wealth to blanket the airwaves touting his loyalty to Trump’s agenda.

Trump’s involvement has become the top issue in the primary, with Oz defending his past stances by noting Trump’s endorsement.

The Hill