ROME — One candidate promised to drop an unpopular new property tax and refund all prior payments in cash. Another called that proposal a “poisoned meatball,” disconnected from reality. A third suggested that Al Qaeda blow up the Italian Parliament — then backtracked — and the man generally considered the front-runner is campaigning on vague promises of stability, so has often been ignored.

With only two weeks to go before national elections, the Italian campaign has become a surreal spectacle in which a candidate many had given up for dead, former Prime Minister Silvio Berlusconi, has surged. Although he is not expected ever to govern again, with his media savvy and pie-in-the-sky offers of tax refunds, Mr. Berlusconi now trails the front-runner, Pierluigi Bersani, the leader of the Democratic Party, by about five or six points, according to a range of opinion polls published on Friday.

The polls found that the former comedian Beppe Grillo, who made the Qaeda quip as part of his antipolitical campaign, is close behind in third place, while the caretaker prime minister, Mario Monti, who made the “poisoned meatball” remark as he stepped up attacks on Mr. Berlusconi in an awkward transition from technocrat to candidate, is taking up the rear with around 10 percent to 15 percent of the vote.

Most analysts predict that the center-left will win, but with not enough votes to govern without forming an alliance with Mr. Monti’s centrists. Yet in a complex political landscape — and with significant policy differences between Mr. Monti and Mr. Bersani, who have been criticizing each other in their campaigns — nothing is a given, and the political uncertainty weighs on financial markets.