WASHINGTON — Representative Kevin McCarthy of California finally secured the House speakership in a dramatic vote ending around 12:30 a.m. Saturday, but the dysfunction in his party and the deal he struck to win over holdout Republicans also raised the risks of persistent political gridlock that could destabilize the American financial system.Economists, Wall Street analysts and political observers are warning that the concessions he made to fiscal conservatives could make it very difficult for Mr. McCarthy to muster the votes to raise the debt limit — or even put such a measure to a vote. That could prevent Congress from doing the basic tasks of keeping the government open, paying the country’s bills and avoiding default on America’s trillions of dollars in debt.The speakership battle that spanned more than four days and 15 rounds of votes suggested President Biden and Congress could be on track …
