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Reports of a possible compromise on the Senate's gun control package will certainly be welcomed at the White House. But it cements where the debate is happening. It's not Democrat vs. Republican. It's NRA vs. the middle.

An assault weapons ban is all-but-dead, which means that the best hope for advocates of new gun restrictions is to expand background checks to cover gun sales at gun shows and for private sales. Sens. Chuck Schumer (D-NY), Joe Manchin (D-WV), Mark Kirk (R-IL), and Tom Coburn (R-OK) worked on a compromise which fell apart last month, prompting Schumer to introduce a proposal that's far stricter than most Republicans could support. Senate Majority Leader Harry Reid pushed out a vote on the issue to this month in hopes that a compromise between the parties could be reached.

Today, The Washington Post reports that it still may. Manchin is working with Pennsylvania's Pat Toomey on an agreement that could be palatable to legislators from both parties — or, at least, to at least 60 of them.

Manchin and Toomey are developing a measure to require background checks for all gun purchases except sales between close family members and some hunters, which addresses concerns of some conservatives, according to the aides, who spoke on the condition of anonymity because they were not authorized to talk publicly about the talks.

Toomey's involvement is seen as key. As the Post notes, a deal between the solidly center-focused Kirk and Manchin would be unlikely to engage anyone from either party. plots each senator's political ideology on a spectrum from left to right, and his or her leadership score (based on how often the senator sponsors bills versus signing on to others') on the vertical axis.. While Toomey's no Tom Coburn, he's at least squarely in the middle of the Republican pack.

See: Tom Coburn | Mark Kirk | Joe Manchin | Pat Toomey

A number of the more conservative members of the Senate have joined Rand Paul in threatening a filibuster of any new rules. It's not clear that the Manchin-Toomey proposal will convince the needed five Republicans — much less the 55 Democrats and independents — that would be needed to break the filibuster. The key consideration is NRA-stoked concern that expanded background checks would lead to a national gun owner reigstry — despite such a thing being illegal under current law. (A recent poll suggests that the argument is also gaining ground with voters.) When the Post says the compromise "addresses concerns of some conservatives," it doesn't mean those who are concerned about such a registry. Toomey and Manchin have to pick up what few Republicans they can from the rest.

This is the remaining battle: the NRA versus the middle. Obama advisors can rail against filibuster threats, but — the bully pulpit of presidential speeches aside — Obama doesn't have much sway on Capitol Hill. The Times articulated his awkward position in an article this weekend.

Members of both parties say Mr. Obama faces a conundrum with his legislative approach to a deeply polarized Congress. In the past, when he has stayed aloof from legislative action, Republicans and others have accused him of a lack of leadership; when he has gotten involved, they have complained that they could not support any bill so closely identified with Mr. Obama without risking the contempt of conservative voters.

The NRA is in the opposite position. As the Post noted this weekend, the organization has seen as much in curtailing state regulations since Newtown as it has in controlling the Congressional debate. That article focuses on Democratic senator Mark Begich of Alaska. After Newtown, Begich claimed a "sea change" in attitudes on regulating weapons. Last month, he co-sponsored a bill with South Carolina's Lindsey Graham that expanded background checks — in precisely the limited way the NRA has advocated.

The Senate is expected to vote on the package of gun legislation next week. It remains to be seen what background check bill — if any — might be approved. After that, the package heads to the House. For those curious how it will fare there, consider this: the president and Democrats liked their chances of strong legislation much better in the Senate.

This article is from the archive of our partner The Wire.

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