According to this article on Yahoo news (hardly a republican friendly news site)
> After a brief spike in interest, the mainstream media coverage of GOP candidate Ron Paul is back to nearly nothing, according to the Pew Research Center's Project for Excellence in Journalism. This week, less than 5 percent of all campaign stories focused on Paul, the lowest point since Dec. 11.
A search of ABC's news site shows no links to actual news stories since Jan. 26 and that is only a single story. There are mentions on various blogs, though those are not really news... they aren't even journalists according to a federal court ruling. I get similar results for NBC and CBS (Google search)
So while "ignore" may be a bit strong a case could be made that they are at least indirectly marginalizing his campaign. Though, it could be that Paul is just not making the newsworthy quotes.