A Republican candidate gained ground against a Democrat candidate on the generic congressional ballot since May, according to a poll by NBC News released Sunday. The generic Republican is ahead of the generic Democrat on the congressional ballot by two points, showing they took the lead, as both parties were tied on the May generic congressional ballot. On NBC News’ August poll, the respondents were asked what was their “preference for the outcome of this November’s congressional elections… a Congress controlled by Republicans or a Congress controlled by Democrats?” The August poll showed that 47 percent would vote for the...