WASHINGTON (AP) — Americans are holding Republicans primarily responsible for the partial government shutdown as public esteem sinks for all players in the impasse, President Barack Obama among them, according to a new poll. It's a struggle with no heroes.The Associated Press-GfK survey, out Wednesday, affirms expectations by many in Washington — Republicans among them — that the GOP may end up taking the biggest hit in public opinion from the fiscal paralysis, just as that party did when much of the government closed 17 years ago. But the situation is fluid nine days into the shutdown and there's plenty of disdain to go around.Overall, 62 percent mainly blamed Republicans for the shutdown.