House Majority Whip Tom Emmer, who has been helping Sen. JD Vance, the GOP vice presidential nominee, prepare for Tuesday night's debate against Minnesota Gov. Tim Walz, said Sunday that the Ohio senator will "do great because he's got the issues on his side." Emmer, R-Minn., has been acting as a stand-in for Walz to help Vance prepare for their stand-off, and told ABC News' "This Week" that he has spent the last month analyzing Walz's previous performances. "I've known Tim probably since he...