The most robust defense of Obamacare on television right now lasts about three seconds and comes from a little-known Texas Democrat named Barbara Mallory Caraway, a former state lawmaker running for Congress.

Her $20,000 spot says last year's government shutdown led by her home-state senator, Republican Ted Cruz, hurt "those people looking for health care insurance."

And that's it for political ads that tout the Affordable Care Act, even as anti-Obamacare ads flood the airwaves.

A Democratic super PAC indirectly plugged the health care law in a December ad, boasting that Sen. Kay Hagan of North Carolina "forced insurance companies to cover cancer and other preexisting conditions." Before that, campaign ad trackers say the last exclusively positive message on Obamacare aired in August when Rep. Frank Pallone of New Jersey bragged about helping to write the law.

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