I'm pretty sure this has been going on for awhile, and it's not just FoxNews, nor even just Republicans. Spamming internet comment sites gives the impression of a "movement" and perhaps makes your army look larger than it really is. A single person can control dozens of usernames and simply spam talking points, vote up conservative posts and generally give you the impression that 95% of Americans are "deeply conservative".
Nowhere is this phantom army more obvious than Yahoo, where pages and pages of posts on their news articles are dominated by conservative talking points.
If you think about it, this is about the cheapest advertising a political party can purchase. If you paid 100 people $8/hour to run 20 monikers each and spam any article about Obamacare with negative testimonials about how their company dropped their coverage and the prices on the exchange are ten times what they were paying, you can create a very real and effective perception that the ACA is destroying America.
I've said it before and I'll say it again. We need to consider legislation tempering political free speech. As the case law currently stands, it's virtually impossible for someone to be sued for libel when engaging in political debate. The notion that those who lie will be punished is simply not the political reality.
I sincerely doubt that the First Amendment was drafted to protect liars and ensure their ability to spread disinformation.