WASHINGTON -- The ad fight continues in Ohio between President Obama’s and Mitt Romney’s campaigns over the auto industry, with Romney doubling down Tuesday with a new radio spot insinuating that the 2009 bailout caused the industry to ship jobs to China.

The Romney campaign asserts that Romney, whose father once headed American Motors Corp., would stand up for the auto industry -- “in Ohio, not China” -- because he grew up in the industry. The ad accuses Obama of championing policies that resulted in the off-shoring of American jobs.