Daytona Beach, Fla. ? President Bush turned the tables Saturday on Sen. John Kerry, declaring “the best way to avoid the draft is to vote for me,” and pledged to oppose mandatory military service. The Democrat stuck to domestic issues, blaming Bush for a shortage of flu vaccines.

Kerry also opposes a draft and has suggested that re-electing Bush would greatly increase the prospects for one. The president, fearing that young voters will be swayed by the charge, fired back, “The person talking about a draft is my opponent.”

With new polls showing the race tied or Bush slightly ahead, both candidates found new ways to go negative while rallying supporters in the campaign’s two most crucial states. The incumbent was in Florida, his challenger in Ohio.

Kerry accused Bush of missing signs that a flu vaccine shortage was imminent. The attack fit into a broader campaign theme: that on Iraq, the economy and many other matters, Bush is disconnected from problems facing Americans.

“What’s happening with the flu vaccine is really an example of everything this administration does: deny it, pretend it’s not there, and then try to hide it when it comes out and act surprised,” Kerry said.

Campaigning in an area heavily dependent on the military, Bush said, “We will not have an all-volunteer army” before correcting himself. “Let me restate that,” he continued. “We will not have a draft … The best way to avoid a draft is to vote for me.”

Polls show that a majority of young voters believe Bush would reinstitute the draft, despite the president’s denials.

Bush and Kerry tailored their appeals. The Democrat, a Catholic, was going to Mass and picking up a hunting license, a pitch to Ohio’s socially conservative Democrats motivated by values and gun rights.

Bush appealed to Florida’s large Jewish population by signing a bill requiring the State Department to document attacks on Jews around the world. The department had opposed the measure, calling it unnecessary.

Upbeat backdrops — Bush appeared in rock-star fashion at a sports arena in Florida and Kerry greeted well-wishers on the porch of a farm in Ohio — contrasted with the sharply critical messages they conveyed to supporters.