MSNBC host Rachel Maddow on Tuesday once again blasted the fact-checking website PolitiFact.

In January, she accused PolitiFact of undermining the word "fact."

This week, the fact-checking website drew Maddow's ire after rating Sen. Marc Rubio's comment that the majority of Americans are conservative as "mostly true."

PolitiFact cited a 2011 Gallup poll, which found 40 percent of Americans described themselves as conservatives, 21 percent described themselves as liberal and 35 percent described themselves as moderate. The website also noted that Gallup has never found that a majority of Americans describe themselves as conservative.

The site was apparently conflating a majority and a plurality -- which is not at all uncommon, but technically wrong.

"Seriously," Maddow said. "Claim A, false. Claim B, false. Overall PolitiFact rating, 'mostly true.' PolitiFact, please leave the building. Do not bother turning off the lights when you leave. We will need them on to clean up the mess you have left behind you as you are leaving."

"PolitiFact, you are a disaster," she added.

Watch video, courtesy of MSNBC, below:

Visit for breaking news, world news, and news about the economy