WASHINGTON -- A batch of new polls from two key battleground states produced some of the largest leads yet for President Barack Obama, drawing criticism from the campaign of Republican nominee Mitt Romney.

In Ohio and Florida, the new surveys from The Washington Post and the polling partnership of CBS News, The New York Times and Quinnipiac University show Obama leading by margins approaching double-digits.

While the margins produced by these and other surveys vary, they collectively point to a consistent underlying trend: Big gains in enthusiasm among Democratic partisans have helped boost Obama since the party conventions.