Gov. Paterson admitted Wednesday he may have improperly billed his campaign for at least one hotel tryst with a girlfriend. The hotel tryst was apparently listed as "constituent services." A Daily News review found that in a handful of other campaign expenditures, Paterson may have used campaign funds to cover personal expenses and misstated their purpose in public disclosure forms. The records also show he made reimbursements, but he acknowledged he may have failed to pony up in one instance. A campaign payment to Lila Kirton, a high-ranking state employee who was one of his paramours, was listed as "professional...