Trump-endorsed candidate J.D. Vance has increased his lead heading into Tuesday’s Ohio Republican Senate primary, a Sunday Trafalgar Group poll revealed.

Twenty-six percent of likely Ohio voters support Vance in the seven-way primary. Vance’s polling has increased once percent since Fabrizio, Lee & Associates polled the race on April 21.

Vance took the lead over rival candidate and former Ohio state treasurer Josh Mandel after Donald Trump endorsed Vance in March.

Mandel, who polled at 18 percent on April 21, is now polling in third place at 20 percent, two points higher than April’s poll. Mandel’s polling has not fluctuated much during the race.

While the two notable candidates have duked it out, candidate Matt Dolan has surged in the polls and found himself in second place with 22 percent support. March and April polling showed Dolan with only nine percent of the vote. In just a few weeks, Dolan’s numbers have shot up 13 percentage points in the crowded race. Dolan has downplayed the significance of Trump’s influence in the Republican Party.