From esteemed appellate lawyer Peter G. in the comments:

In Pennsylvania, where I live, the Republican committees are working as hard as they can, not so much to get out their vote as to suppress and discourage ours. They are flooding Democratic households, particularly those with regular voters, with telephone robocalls which begin: "I'm calling with important information about {name of Democratic candidate}." Identical calls are placed repeatedly to the same household, often at inconvenient or even disruptive hours (late at night). The calls violate election law by failing to identify up front who sponsored them. Many people think the calls are in support of the named candidate, but in fact the message is deceptive and false. Thus, if the caller hangs up right away in frustration, s/he is likely to think the Dem is to blame; this is the goal, to make people mad and reluctant to vote for the candidate. Or if they listen, they are being bombarded with a negative message.