WINTER PARK, Fla. — President Obama on Thursday continued his swing-state offensive against Mitt Romney’s tax-cut plans, deriding them as a boon to the rich at the expense of everyone else — “trickle-down tax-cut fairy dust,” he called them at a college here.

As for everyone else, Mr. Obama stopped short of repeating a first-term promise: that households making less than $250,000 a year would not see their income taxes increase “by a single dime” for the next four years. On Friday, when the monthly unemployment report will come out, the president will meet at the White House with middle-income voters to press Republicans in Congress to extend the expiring Bush-era tax rates except on annual incomes above that threshold.

In Florida, the president spoke at Rollins College, a small liberal arts campus here, to about 2,400 spirited supporters, before heading to another event in Northern Virginia. As he had at rallies the day before in a third battleground state, Ohio, Mr. Obama seized on an analysis of Mr. Romney’s $5 trillion tax cut proposal by the nonpartisan Tax Policy Center to argue that his rival’s plan would mean big reductions in income taxes for the wealthy and an increase for 95 percent of American taxpayers.

“He’s asking you to pay more so that people like him can pay less,” Mr. Obama said. “So that people like me pay less.”