(VIDEO-AT-LINK)Attorney General Eric Holder is challenging Republicans who are calling for his and President Obama's impeachment, and denouncing what he calls a "gridlocked Washington" stalled by what he says is a Republican Party bent on blocking any of the administration's efforts. “For whatever reason, [some] Republicans decided early on that this was a president they were just simply not going to cooperate with,” Holder said in a rare interview with ABC News' Pierre Thomas. "And over the past five-and-a-half years, we have seen demonstrations of that, where the president has reached out his hand, offered compromises that have simply not...