Support for Republican U.S. presidential contender Nikki Haley has risen in opinion polls in recent months largely on the back of college-educated, affluent, suburban professionals, many of whom have tired of former U.S. President Donald Trump's caustic rhetoric and legal troubles.

If the former South Carolina governor is to ascend any further and have a real shot at beating Trump in the 2024 Republican nominating contest, supporters and opponents say she must expand that coalition — and quickly.

That means pulling in more voters who live in rural areas, are middle- or working-class, or lack college degrees, according to eight pollsters and strategists. Some are affiliated with the Haley nomination effort and some are independent.