CNBC's Jim Cramer unpacked Thursday's market decline, telling investors that Wall Street is worried about the lengthy government shutdown and that artificial intelligence buildout is getting out of control."What matters is we need the darn government to go back to work, and we need the data center blob to be cordoned off from the rest of the economy, and we need some of the hottest stocks to continue to cool off further," he said. "Until then, we are indeed at the mercy of the headlines and, lately, the dar ...