For months now, America Rising has sent out a steady stream of posts on social media attacking Mrs. Clinton, some of them specifically designed to be spotted, and shared, by liberals. The posts highlight critiques of her connections to Wall Street and the Clinton Foundation and feature images of Democrats like Senator Elizabeth Warren of Massachusetts and Mayor Bill de Blasio of New York, interspersed with cartoon characters and pictures of Kevin Spacey, who plays the villain in “House of Cards.” And as they are read and shared, an anti-Clinton narrative is reinforced…

Conservative strategists and operatives say they are simply filling a vacuum on the far left, as well as applying the lesson they learned in 2012, when they watched in frustration as Mitt Romney was forced to expend time and resources in a protracted primary fight. By the time he secured his party’s nomination, President Obama hardly had to make the case that his opponent was a coldhearted plutocrat; Republicans like Newt Gingrich had already made the argument for him in the primaries…

“The idea is to make her life difficult in the primary and challenge her from the left,” said Colin Reed, America Rising’s executive director. “We don’t want her to enter the general election not having been pushed from the left, so if we have opportunities — creative ways, especially online — to push her from the left, we’ll do it just to show those folks who she needs to turn out that she’s not in line with them.”