"Really hard to tell that just by looking at the Colorado data all by itself," said Glen Mays, professor of public policy for the Colorado School of Public Health. Colorado's weekly vaccination totals show a decline in vaccinations leading up to, and even after, Polis' contest announcement on May 25. The week of the announcement saw a 35% drop in vaccinations. The following week -- the week of Memorial Day -- the drop was 21% from the week prior. The week of June 6, however, saw an 11% increase, followed by a drop again.