Secretary of State Marco Rubio has vaulted from single digits to a near-tie with Vice President JD Vance in hypothetical 2028 Republican presidential primary polling, a shift that complicates Vance's once-dominant position as President Trump's heir apparent.
The movement has been swift and steep. An Emerson College poll released in late May showed Rubio at 35% support among likely Republican primary voters, just one point behind Vance at 36%. That gap was far wider only months earlier: in August 2025, Vance commanded 52% to Rubio's 9%. By February 2026, Rubio had climbed to 20% while Vance held at 52%. The New York Post reported the latest numbers as a 15-point Rubio surge since February alone.
A separate University of New Hampshire poll told a similar story. Vance led 36% to 26% among likely Granite State GOP primary voters, but that same survey had Vance ahead 53% to 7% in February. Fox News reported the shift complicates Vance's status as the presumptive frontrunner for 2028.
Spencer Kimball, executive director of Emerson College Polling, framed the change bluntly:
"The Republican primary has shifted significantly since February, when 52% supported Vance and 20% Rubio; the potential 2028 contenders now compete evenly."
The numbers did not move in a vacuum. Rubio's tenure as Secretary of State has given him a public platform and a string of high-profile foreign policy moments that Vance, operating in the more constrained role of vice president, has not matched.
The Washington Examiner detailed how Rubio led efforts that resulted in Venezuelan dictator Nicolás Maduro being captured and imprisoned in New York, with a new, more cooperative government installed under Delcy Rodríguez. Rubio warned Venezuela's incoming leadership directly:
"We are prepared to use force to ensure maximum cooperation if other methods fail."
That approach, diplomacy backed by credible military force, has become Rubio's calling card. He also publicly broke with the administration's Iran nuclear deal negotiations, which were described as "Vance's baby." Those talks resulted in billions in sanctions relief that Iran quickly violated, a sequence that did not reflect well on the vice president's portfolio. Rubio, by contrast, kept his distance from the deal and avoided the fallout.
On the Israeli-Palestinian front, Rubio staked out a firm position, stating that promising terrorists their own state "makes Hamas feel more emboldened" and sabotages actual negotiating attempts. The line drew praise from hawkish Republican voters and foreign policy conservatives who see Rubio as more willing to confront adversaries than negotiate with them.
President Trump has done little to cool the competition. He has praised Rubio as potentially "the greatest secretary of state in history" while also floating a Vance-Rubio ticket as "unstoppable", and has gone so far as to poll crowds at speeches on whether they prefer Vance or Rubio for 2028. Fox News reported that Trump called a potential Vance-Rubio pairing a "dream team."
Both men have publicly downplayed any rivalry. An anonymous operative in Trump's political orbit told Fox News that "Vice President Vance is the future of the Republican Party, and Marco Rubio is one of his closest friends in the administration." But the numbers suggest the friendship is under strain, at least among the voters who will ultimately decide.
Behind the scenes, a group of GOP donors supporting Rubio is quietly exploring ways to boost his political profile. Fox News reported the effort is causing tension inside Trump's political orbit, where Vance allies view any organized Rubio operation as a threat to the succession plan.
The Emerson data revealed a generational split. Rubio leads among Republican voters over 50, pulling 41% to Vance's 35%. Vance holds the advantage among voters under 50, leading 37% to 26%. That divide matters because older primary voters turn out at higher rates and tend to dominate early-state contests like Iowa and New Hampshire.
On the Democratic side, the same Emerson poll showed Transportation Secretary Pete Buttigieg leading the 2028 field at 18%, pushing past California Governor Gavin Newsom. But the real energy, and the real uncertainty, sits on the Republican side, where a race that looked settled six months ago now looks wide open.
One anonymous longtime Republican strategist offered a frank assessment of Vance's position to Fox News:
"Vance is in the catbird seat until something really goes bad, and Trump is going to blame him."
That quote captures the dynamic. Vance still leads, but his margin has evaporated, and the risks of his current role, owning policy outcomes that can go sideways, are real. Rubio, meanwhile, has the luxury of racking up visible wins abroad while someone else absorbs the domestic blame. A Newsmax report referencing more recent Emerson polling suggests the trajectory has continued into August 2026, though full details of that survey were not immediately available.
Rubio's rise carries a lesson Republicans should welcome. His polling gains did not come from attack ads, cable news feuds, or social media stunts. They came from doing the job, confronting a dictator, projecting strength, and producing outcomes voters can point to. That is the kind of political capital that compounds.
Vance remains the frontrunner. He has Trump's endorsement infrastructure, the institutional advantages of the vice presidency, and two more years to build his case. But frontrunner status is a depreciating asset when someone else is delivering results that show up in the headlines every week.
Republican voters are watching both men do their jobs, and the scoreboard is tightening. If the party wants to win in 2028, that competition is a feature, not a problem.
