Late night funny man Stephen Colbert has made a habit out of putting members of Congress in uncomfortable spots over the years in a regular segment on his satirical program, The Colbert Report.

Thursday night, that segment featured U.S. Rep. Russ Carnahan (D-St. Louis), who is locked in a redistricted primary with U.S. Rep. William Lacy Clay in the 1st Congressional district.

But Colbert began the Q & A focusing on Monsanto, the Creve Coeur agri-giant. Colbert asked if the company's headquarters were in his district (the new 1st), and Rep. Carnahan said it was.

Click here to go to the Colbert Nation website to see the segment

Under the new boundaries, the company's headquarters appear to be physically located in the new 2nd Congressional district, with Warson Road being the dividing line, literally across the street.

Colbert jokingly asked Carnahan how he felt about Genetically Modified Foods, or GMOs, including if the Congressman was a "vegetable from the labs of Monsanto."

Shortly after the segment aired, Rep. Clay's campaign Twitter account chided his opponent over the appearance in what are now the final days after a tense campaign. 

"What a GREAT match: one pretends to be a Newscaster the other pretends 2 represent St. Louis," Clay's campaign tweeted.

Do you think the 'Colbert Report' appearance will sway any minds between now and Tuesday, either way? Tell us in the comment section.