During this episode, Bartlet expresses concern that the poll put into the field by Josh & Joey Lucas will cause the public to think that he revealed his medical condition (MS) not because he wanted to, but because a poll said he should. Leo counters that they'll avoid that issue by making sure that nobody finds out--that is, nobody connects the dots.
Excuse me, but how? Several thousand random people get a phone call one night asking them how they'd feel if a state governor failed to disclose a neurological condition before running for office. A few days (or weeks) later, the President announces that he failed to disclose a major neurological condition before running for office. Who wouldn't put two and two together?