It may be the dog days of summer, but unlike members of Congress, partisan bickering takes no vacation.

On Monday, Conor Clarke, a senior at Amherst College and summer intern at The Washington Monthly, went to the Young America’s Foundation’s annual National Conservative Student Conference.

He told the organizers he was there to report on the event for the magazine. But he didn’t tell them that he was also there to blog the event for Campus Progress, a liberal student group that had already been denied press credentials by the foundation.

Mr. Clarke’s side job was discovered pretty soon, and he was asked to leave the conference by the foundation’s spokesman, Jason Mattera.

“There’s the elevator,” Mr. Mattera told him, according to Mr. Clarke’s account. “I can have one of my interns push the down button.”

Mr. Clarke has accused him of censorship and small-mindedness. But Mr. Mattera says Mr. Clarke was dishonest and out to make trouble.

“Campus Progress is a left-wing smear group that does not accurately represent our events and is not a news organization,” he told The Chronicle. “We don’t need people who are going to be falsifying or hiding the truth at our conference.”