Robert F. Kennedy Jr: Jim Inhofe Is 'Big Oil's Top Call Girl'

Not all the drama on Tuesday night involved Super Tuesday.

Robert Kennedy Jr. issued a strong criticism of Sen. Jim Inhofe (R-Okla.) on Twitter.

"Speaking of prostitutes, big oil's top call girl Sen Inhofe wants to kill fuel economy backed by automakers, small biz, enviros, & consumers," he tweeted.

Inhofe is an outspoken critic of the Environmental Protection Agency and has referred to climate change as "the greatest hoax ever perpetrated on the American people." Recently, he sent a letter to EPA head Lisa Jackson demanding a probe of the agency's activities.

Kennedy works for the Natural Resources Defense Council and, according to ABC, was once considered for the EPA's top position.

"It's hard to believe that Robert Kennedy Jr. would choose to use such language -- especially this week," an Inhofe spokesman told Politico, referring to Rush Limbaugh's recent controversy, in which the talk radio host called Georgetown Law student Sandra Fluke a "slut" and a "prostitute" for speaking out in favor of the Obama administration's contraception mandate. "I bet he now regrets it."

Kennedy, however, doesn't seem to be backing down. In an apparent shot back at Inhofe, Kennedy on Wednesday tweeted, "To my critics: What do you call a politician -- democrat or republican -- who sells the public interest for money?"