A federal judge has thrown out an obstruction charge against a defendant charged with breaching the Capitol on Jan. 6, 2021, a ruling that could reverberate across hundreds of cases stemming from the attack on Congress. In a 29-page opinion issued Monday, U.S. District Court Judge Carl Nichols ruled that ambiguities in the federal obstruction law required him to narrow the case against defendant Garret Miller, who is facing multiple felony charges connected to the attack. Under that narrow interpretation, Nichols ruled, defendants can be charged with obstruction only if they directly attempt to affect “a document, record, or other...