Tea party activists, once unquestioned as a benefit to the Republican Party for supplying it with votes and energy, are now criticizing GOP leaders at seemingly every turn. They’re demanding that Congress use upcoming budget votes to deny money for putting in place President Barack Obama’s 2010 health care law, despite warnings the strategy could lead to a government shutdown. They’re upset that Republicans didn’t block a Senate-passed immigration bill. Many are outspoken opponents of any U.S. involvement in Syria’s civil war. A recent Pew Research Center survey found that more than 7 in 10 self-identified “tea party Republicans” disapprove...