The partisan sniping surrounding Russia's annexation of Crimea is still hot. Sen. John McCain (R-Ariz.) recently said the White House response to Russia's actions has been "timid." Senate Majority Leader Harry Reid (D-Nev.) implied that Republicans deserve the blame, saying events may have "unfolded differently" if Republicans hadn't held up his Ukraine aid bill.

And yet, aid to Ukraine won a big bipartisan vote this week. Reid jettisoned a provision reforming the International Monetary Fund resisted by Republicans, and in return, Republicans are buttressing President Obama's approach to Russia instead of undermining it.

Might this be a return to the mythic days of old when partisan politics stopped "at the water's edge"?

Despite all the political flak in the air, the two parties are being brought closer together over Russia. A common animus toward Russian President Vladimir Putin has emerged, with many Republicans skeptical of Russia's interest in diplomacy and many Democrats seething at Putin for whipping up homophobia in his country.

But there are other factors, beyond an easy dislike of the Russian strongman, that help diminish the partisan daylight.

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One is the widespread war-weariness after the messy outcomes of Iraq and Afghanistan, which is hemming in the militaristic impulses of the Right. As Paul Waldman, writing in the Washington Post, recently observed, the neoconservative "tough guys" aren't being so tough anymore: "These days it's all imposing sanctions and freezing assets and boycotting economic summits and making statements."

Case in point: McCain, in a speech earlier this month scorching Obama for being "M.I.A.", was forced to concede that in Ukraine "there is not a military option that can be exercised now." McCain and other Republicans had been pressing Obama to levy economic sanctions, expel Russia from the Group of Eight, and — in what amounts to the closest call for actual military action — send military aid to the Ukrainian government. Obama did the first two and has left the door open to the third. Furthermore, the Senate's No. 2 Democrat, Richard Durbin (Ill.), not considered to be hawkish, backs military aid.

The second factor is a shared bipartisan unease with the public's turn toward isolationism, and the potential for Sen. Rand Paul (R-Ky.) to capitalize on it in the 2016 presidential campaign. The percentage of the public that believes America should "take the leading role among all other countries in the world in trying to solve international conflicts" is down 17 points since 2003, hitting 31 percent in a February CBS/New York Times poll.

McCain vented his concern with Paul's rising influence last year when he said, "There are times these days when I feel that I have more in common on foreign policy with President Obama than I do with some in my own party." These remarks are proving more relevant than his broadsides against Obama. It was McCain who led the Republican charge in the Senate for Ukraine aid, while Minority Leader Mitch McConnell (R-Ky.) shed his long-standing internationalism in order to fight for his political life in the state that Paul also represents.

If these seem like thin reeds on which to claim the return to a bipartisan foreign policy, keep in mind that partisanship beyond the water's edge has long been standard operating procedure, not the other way around.

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Senate Republicans thwarted President Woodrow Wilson's dream for a League of Nations. Dwight D. Eisenhower won the presidency by slamming Harry Truman's handling of the Korean War. Adlai Stevenson later accused Eisenhower of losing the Cold War. Richard Nixon challenged Lyndon Johnson's management of the Vietnam War, and four years later George McGovern was doing the same to Nixon. Republicans savaged President Jimmy Carter for ceding control of the Panama Canal to Panama and for the Iran hostage crisis. Democrats were panicked that Ronald Reagan was going to get us into a nuclear war with the Soviets, and the Reagan administration was hobbled by the Iran-Contra affair. House Republicans refused to back President Bill Clinton's bombing campaign to stop ethnic cleansing in Kosovo. And of course, Democrats pounded George W. Bush over Iraq.

Just to name a few.

So a degree of public friction is always to be expected. In many of the above cases, disputes were based on deep philosophical differences regarding the value of confrontation and negotiation. Those differences remain today as Republicans scoff at Obama's negotiations with Iran and the Palestinian Authority.

But there might be something new at work regarding Russia. Republicans are shying away from crude militarism, while President Obama is turning toward confrontation, and the ideological gap has narrowed. If that proves to be an anomaly that only applies to Russia, little has really changed. But if this common ground leads to a broader understanding of foreign policy objectives and tactics between the parties, that could bolster a true bipartisan consensus as Obama finishes the final leg of his presidency.