Live: House Majority PAC, the super PAC aligned with Representative Hakeem Jeffries, the New York Democrat and minority leader, has purchased ad spots for the first time in New York’s sprawling 21st Congressional District, which covers an area from the suburbs of Albany to the Canadian border. The roughly $300,000 in late spending, according to ad-tracking firm AdImpact, suggests that Democrats are looking to press their advantage in a favorable political environment. Registered Republicans outnumber Democrats by roughly 80,000 in the district, but President Trump’s tariffs on Canada among other issues have given Democrats hope that Blake Gendebien, a dairy farmer, can flip a seat Republicans have held for much of the past 150 years.