Democrats who choose to vote in the Republican primary but don't support the party's policies "are committing election falsification by stating that they do in fact support those principles," says law professor Dan Tokaji, an Ohio State University election law expert. "Will they be prosecuted? Almost certainly not."
"It's not likely to result in a seismic shift in turnout, but it can make a difference in close races," he said. "There may be some voters teetering on the edge in terms of whether they'll come out to vote."