At least two influential unions will spend close to $100 million on the 2010 election, with most of those funds going to protect incumbents. Union officials told The Hill they plan to help endangered members — particularly freshmen — who made politically difficult votes in a year during which an anti-incumbent mood has filled the country. And the number will be even higher since the AFL-CIO declined to give its figures. While the labor movement has displayed an aggressive tack in Democratic primaries, including supporting some challengers over incumbents, it remains concerned about the party retaining its congressional majorities. As...