Mormons make up only about 4 percent of the state’s population, but their influence in Nevada’s Republican caucuses is much greater. In 2008 and 2012, members of the church accounted for nearly a quarter of Republican caucusgoers, entrance polls showed.

Both Cruz and Rubio — who attended an LDS church in Las Vegas in his youth — have enlisted politically prominent members of the church, and now the fault line on taxes that split the state’s Republicans this spring and summer has come to the forefront.

Rubio’s side includes prominent backers of the tax increase, aimed at expanding the state’s budget for schools, which Republican Gov. Brian Sandoval pushed through the GOP-controlled Legislature in May and June. The tax hike, the largest in state history, was strongly opposed by a large portion of the Republicans in the Legislature.

Also among Rubio’s backers is Bruce Woodbury, a Mormon and former Clark County commissioner who is so admired in southern Nevada that the I-215 beltway around Las Vegas is named after him.