A tea party leader is favored to become Texas' lieutenant governor. A Ted Cruz-endorsed newcomer is inching closer to replacing Democrat Wendy Davis in the statehouse. On television, millions of dollars in attack ads have given established Republican incumbents all they can handle. For all the talk of Texas growing competitive for Democrats in 2016 and beyond, GOP voters are poised to make a harder turn right on Tuesday. Though the tea party has sputtered this year in elections around the country, Texas' conservative insurgents are the front-runners in Republican primary runoffs for major statewide offices and positioned to bolster...