Ted Cruz

Stream the first of three debates between U.S. Senate candidates, Beto O'Rourke and incumbent Ted Cruz. The two will face off for the first time in Dallas for a one-hour debate, beginning at 6 p.m. Tonight's discussion will focus primarily on domestic policy.

The Ted Cruz and John Kasich campaigns announced apparent coordinated strategies to combat Donald Trump in select upcoming primaries — an effort to force an open convention when the Republican National Committee gathers in Cleveland in July.

In a statement sent out Sunday evening, the Cruz campaign said it will focus resources on Indiana, "and in turn clear the path for Gov. Kasich to compete in Oregon and New Mexico."

The last Texas Republican to occupy the Oval Office, George W. Bush, took 49 percent of the state’s Hispanic vote in his 2004 presidential re-election, setting a relatively high bar for the handful of Texas-born or -raised Republicans who might be hoping to follow in his footsteps in 2016.

Republican presidential aspirants with ties to the Lone Star State must figure out how to hold the GOP base and attract conservative Hispanics if they want to be successful in Texas, political observers say.