March 14 (Bloomberg) — President Barack Obama's health care law is fueling an explosion in early television advertising before November's congressional elections, with close to half the commercials attacking the measure.

More than 66,000 ads in U.S. House and Senate races aired through March 9, more than triple what candidates and allied groups aired during a comparable period four years ago, according to New York-based Kantar Media's CMAG, which tracks advertising.

Most of the ads spotlight health care, underscoring how the Affordable Care Act — Obama's signature domestic achievement — may become a defining issue determining whether Republicans maintain control of the House and Democrats keep their Senate majority for the last two years of his presidency.

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