Secretary of State Marco Rubio runs stronger than Vice President JD Vance against four of five potential Democratic nominees in hypothetical 2028 matchups, a gap that could reshape the GOP primary before it starts.

An Emerson College Polling survey conducted for The Hill on August 16, 17 tested both Republicans against a slate of Democratic contenders, and the results paint a consistent picture: Rubio closes margins that Vance cannot. In four of the five head-to-head contests, Newsmax reported, the secretary of state either flipped a deficit into a lead or shrank the Democrat's advantage by several points.

The survey polled 1,000 likely voters and carries a credibility interval, the polling equivalent of a margin of error, of plus or minus three percentage points. At least six percent of voters remained undecided in every matchup, leaving room for movement. But the pattern across nearly every contest ran the same direction: Rubio outperformed Vance.

Harris beats Vance by four, then loses to Rubio by five

The starkest gap showed up in the matchup against former Vice President Kamala Harris. Harris led Vance 49 percent to 45 percent, a four-point edge. Against Rubio, the numbers reversed entirely: Rubio led Harris by five points.

That is a nine-point swing between the two Republicans against the same Democrat. For a party trying to hold the White House, the difference between trailing by four and leading by five is not a rounding error.

California Gov. Gavin Newsom followed a similar pattern. Newsom led Vance by five points but held only a two-point edge over Rubio. Sen. Jon Ossoff of Georgia led Vance by five and Rubio by three. In both cases, Rubio cut the deficit but did not erase it.

Vance's midterm campaign activity has already drawn attention as potential groundwork for a 2028 run. But the Emerson numbers suggest his general-election ceiling may be lower than his primary-election floor.

Buttigieg is the one Democrat who handles both Republicans equally

Former Transportation Secretary Pete Buttigieg was the lone Democratic contender who performed identically against both Republicans. He led Vance by five points and led Rubio by five points, the only matchup where Rubio's advantage over Vance disappeared.

That result stands out against the broader trend. Whether it reflects Buttigieg's crossover appeal or some other factor, the poll does not say. But it breaks the pattern that held everywhere else in the survey.

Rep. Alexandria Ocasio-Cortez of New York was the weakest performer on the Democratic side. She trailed Vance by two points and Rubio by five. She was the only Democrat who lost to both Republicans, and it was not close against Rubio.

For Democratic strategists weighing their 2028 bench, the Ocasio-Cortez numbers carry a blunt message. A candidate who trails both potential Republican nominees before the race even starts faces a steep climb. Meanwhile, a recent GOP pollster finding that MAGA voters may prefer neither Vance nor Rubio adds another variable to an already crowded picture.

Primary polls show a near-deadlock between Vance and Rubio

The general-election gap between the two Republicans exists alongside a razor-thin primary race. A July Emerson national poll of Republican primary voters showed Vance at 39 percent and Rubio at 38 percent, a single-point margin well within the margin of error. An earlier May survey had Vance at 36 percent and Rubio at 35 percent.

The trajectory is clear: both men have been gaining, and neither has broken away. The primary electorate appears almost evenly split, even as the general-election data suggests one of them would be a significantly stronger nominee against most Democratic opponents.

Neither man has formally announced a 2028 campaign. Vance has said he plans to discuss a potential run with his wife after November's midterms. Rubio has indicated he would defer to Vance if the vice president decides to run, a gesture of party loyalty that could become harder to sustain if polling like this keeps landing.

President Trump has praised both men, previously suggesting a Vance-Rubio combination would make "a great team." That framing sidesteps the question of who leads the ticket, a question the Emerson data answers differently depending on whether you are looking at primary voters or general-election matchups.

Rubio, who sought the Republican presidential nomination in 2016, brings a longer track record on the national stage. His current role as secretary of state keeps him in the foreign-policy spotlight, a position that historically lends credibility to presidential candidates. Recent White House personnel shifts have also drawn attention to the internal dynamics surrounding both men's political futures.

Six percent undecided in every matchup leaves the door open

The undecided share, at least six percent across the board, means none of these results are locked in. In a race where several matchups fall within single digits, that bloc of uncommitted voters could tip any contest either way.

Polls taken more than two years before a general election carry obvious limitations. Candidates have not yet campaigned, debated, or faced the scrutiny of a real primary. Name recognition, favorability, and issue positioning will all shift. The political environment of 2028 may look nothing like the environment of August 2026.

But early polls do measure something real: baseline voter comfort with a candidate. And on that score, Rubio consistently starts from a stronger position than Vance against the Democrats most likely to run. The internal tensions already visible within Republican politics suggest that the 2028 primary will not be a coronation for anyone.

Vance's public remarks on faith and politics have energized parts of the conservative base, and his proximity to the presidency gives him institutional advantages no poll can measure. Rubio's edge, by contrast, shows up where it matters most in November: among the broader electorate that decides general elections.

Republicans have a strong hand heading into 2028. The question is whether they play the card that polls best with the whole table, or the one that feels most comfortable in the primary.