CARSON CITY, Nev. (AP) — Nevada Sen. Harry Reid is continuing his verbal drumming for Republican presidential candidate Mitt Romney to release more of his tax returns.

In a speech Tuesday at the Democratic National Convention, the Senate Majority Leader portrayed the Republican Party as "naysayers" and elitists who favor the wealthy over the middle class, and called Romney the biggest proponent of a "rigged game."

Last month Reid claimed without proof that Romney may not have paid income taxes for years despite his wealth.

Romney has denied it, and Reid refused to say who had told him otherwise.

In his speech Tuesday, Reid praised President Obama for his handling of the Great Recession and health care reform, and said re-electing Obama will move the country forward.