There hasn’t been much polling in competitive Senate races since the Obamacare meltdown began. But what has come out has been generally bad news from Democratic incumbents running for re-election in states won by Mitt Romney in 2012.

Sen. Mary Landrieu (D-LA) is learning this the hard way. Her unwavering support of Obamacare has driven her approval rating downward, according to a poll released last week by Southern Media and Opinion Research, a Louisiana-based polling firm.

Though Landrieu insists that she’s “not concerned about anything” in regard to her re-election, the poll found that 46% of Louisiana voters approve of her’s job performance, a 10-point drop from six months ago, while 51% disapprove.

There isn’t much good in terms of prospects for re-election. Obamacare is clearly her biggest hurdle to overcome, as the poll found that just 34% support the law, while 59% are against it.

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