In 2016, the only battleground state Senate Republican to falter in a re-election bid was New Hampshire's Kelly Ayotte. Â She fell by the slimmest of margins -- losing by roughly 1,000 votes (0.2 percentage points) statewide. Â Conservative third party candidate Aaron Day ended up receiving more than 17,000 votes in the contest, tipping it to Democrat Maggie Hassan, who was also helped by a Libertarian candidate pulling in more than 12,000 ballots. Â The little-known Day's candidacy benefited from anonymous mailers sent to Republican voters designed to attack Ayotte "from the right." Â The liberal outfit behind the ads peddled their mischief...