Rush Limbaugh, one of the most popular conservative radio hosts in the US, is infamous for his controversial and often off-colour remarks.<br /><br />Dubbed a political "shock jock", Limbaugh's show is broadcast on some 600 radio stations across the country, where he earns millions talking up Republican policies and opposing Democratic ones.<br /><br />But he faced wide criticism for offensive remarks he made about a female student who had spoken up in favour of Obama administration plans to make insurance companies pay for birth control - including pressure from his advertisers - which resulted in him issuing a rare apology live on-air.<br /><br />Al Jazeera's John Terrett reports.
