Because it’s just so hard to keep track of which political party you belong to on any given day.
From the Associated Press:
STATE COLLEGE — U.S. Sen. Arlen Specter, on tour to announce the start of 60 college campus-based campaign offices, took a moment Tuesday at the Penn State’s HUB Robison Center to thank his supporters.
“I’m proud to be endorsed by the College Republicans …” he began, and was interrupted by an aide, who sharply reminded Specter that the endorsement came from the Young College Democrats.
UPDATE: Here’s the video: