MICHAEL BARONE: Astonishing poll shows 38-year Democratic congressman down 14 points.

This is astonishing for several reasons. Rahall, first elected in 1976, is now the seventh most senior member of the House, with three of the more senior members retiring (John Dingell, Henry Waxman, George Miller) and another with a serious primary challenge (Charlie Rangel). Moreover, his district in southern West Virginia has historically been very Democratic; in its previous boundaries it voted for Walter Mondale over Ronald Reagan in 1984. Rahall won in 1976 by 46 percent to 37 percent over Ken Hechler, his predecessor in the seat, who after losing a Democratic primary for governor ran as a write-in candidate; the Republican nominee received only 18 percent of the vote. From 1978 to 2008, Rahall was re-elected with at least 64 percent of the vote, except in 1990 when he beat Republican Marianne Brewster by only 52 percent to 48 percent.

But this is coal country, and Rahall’s margins have gone down after President Obama was elected president. In 2010, Rahall won by a reduced margin of 56 percent to 44 percent, and in 2012, his margin was only 54 percent to 46 percent. Obama’s unpopularity surely cost him: John McCain carried the district within its then-boundaries by a 56-percent to 42-percent margin in 2008, and Mitt Romney carried the current district 65 percent to 33 percent in 2012. Rahall is ranking Democrat on the Transportation and Infrastructure Committee and was Chairman of the Natural Resources Committee when Democrats had a majority in the House; these are committee positions of importance to a mountainous coal district, but apparently they are not enough to help him now.

Obama’s a millstone around a lot of necks this election cycle.