Sarah Palin has impeccable timing. The former Republican vice presidential nominee took to her Facebook page Thursday afternoon to warn freshman Republicans in the House that they just might face primary opposition if they cave in to demands by their party to raise the debt ceiling. “All my best to you, GOP Freshmen, from up here in the Last Frontier. Sincerely, Sarah Palin,” she wrote. “P.S. Everyone I talk to still believes in contested primaries.” Just two hours later, House Speaker John A. Boehner was forced to postpone the vote on his proposal to increase the debt ceiling at the...