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The ability of NASA's Mars Reconnaissance Orbiter to continue charting the locations of these hidden glaciers and ice-filled valleys -- first confirmed by radar two years ago -- adds clues about how these deposits may have been left as remnants when regional ice sheets retreated. The subsurface ice deposits extend for hundreds of kilometers, or miles, in the rugged region called Deuteronilus Mensae, about halfway from the equator to the Martian north pole. Jeffrey Plaut of NASA's Jet Propulsion Laboratory, Pasadena, Calif., and colleagues prepared a map of the region's confirmed ice for presentation at this week's 41st Lunar and Planetary Science Conference near Houston. The Shallow Radar instrument on the orbiter has obtained more than 250 observations of the study area, which is about the size of California. "We have mapped the whole area with a high density of coverage," Plaut said. "These are not isolated features. In this area, the radar is detecting thick subsurface ice in many locations." The common locations are around the bases of mesas and scarps, and confined within valleys or craters. Plaut said, "The hypothesis is the whole area was covered with an ice sheet during a different climate period, and when the climate dried out, these deposits remained only where they had been covered by a layer of debris protecting the ice from the atmosphere."

Why haven't the President and Senate Democrats pulled the reconciliation trigger before now? I haven't spoken directly with the President or with Harry Reid but I've spent the last several weeks sounding out contacts on the Hill and in the White House to find an answer. Here are the theories. None of them justifies waiting any longer. Reconciliation is too extreme a measure to use on a piece of legislation so important. I hear this a lot but it's bunk. George W. Bush used reconciliation to enact his giant tax cut bill in 2003 (he garnered only 50 votes for it in the Senate, forcing Vice President Cheney to cast the deciding vote). Six years before that, Bill Clinton rounded up 51 votes to enact the Children's Health Insurance Program (CHIP), the largest expansion of taxpayer-funded health insurance coverage for children in the U.S. since Medicaid began in the 1960s. Through reconciliation, we also got Medicare Advantage. Also through reconciliation came the COBRA act, which gives Americans a bit of healthcare protection after they lose a job ("reconciliaton is the "R" in the COBRA acronym.) These were all big, important pieces of legislation, and all were enacted by 51 votes in the Senate. Use of reconciliation would infuriate Senate Republicans. It may. So what? They haven't given Obama a single vote on any major issue since he first began wining and dining them at the White House. In fact, Senate Minority Leader Mitch McConnell and company have been doing everything in their power to undermine the President. They're using the same playbook Republicans used in the first two years of the Clinton administration, hoping to discredit the President and score large victories in the midterm elections by burying his biggest legislative initiative. Indeed, Obama could credibly argue that Senate Republicans have altered the rules of the Senate by demanding 60 votes on almost every initiative - a far more extensive use of the filibuster than at any time in modern history - so it's only right that he, the President, now resort to reconciliation. Obama needs Republican votes on military policy so he doesn't dare antagonize them on health care. I hear this from some quarters but I don't buy it. While it's true that Dems are skeptical of Obama's escalation of the war in Afghanistan and that Republicans are his major backers, it seems doubtful R's would withdraw their support if the President forced their hand on health care. Foreign policy is the one area where Republicans have offered a halfway consistent (and always bellicose) voice, and Dick Cheney et al would excoriate them if they failed to back a strong military presence in the Middle East. This is truer now than ever. Reid fears he can't even get 51 votes in the Senate now, after Scott Brown's win. Reid counts noses better than I do, but if Senate Democrats can't come up with even 51 votes for the health care reforms they enacted weeks ago they give new definition to the term "spineless." Besides, if this is the case, Obama ought to be banging Senate heads together. A president has huge bargaining leverage because he presides over an almost infinite list of future deals. Lyndon Johnson wasn't afraid to use his power to the fullest to get Medicare enacted. If Obama can't get 51 Senate votes out of 58 or 59 Dems and Independents, he definitely won't be able to get 51 Senate votes after November. Inevitably, the Senate will lose some Democrats. Now's his last opportunity. House and Senate Democrats are telling Obama they don't want to take another vote on health care or even enact it before November's midterms because they're afraid it will jeopardize their chances of being reelected and may threaten their control over the House and Senate. I hear this repeatedly but if it's true Republicans have done a far better job scaring Americans about health care reform than any pollster has been able to uncover. Most polls still show a majority of Americans still in favor of the basic tenets of reform - expanded coverage, regulations barring insurers from refusing coverage because of someone's preexisting conditions and preventing insurers from kicking someone off the rolls because they get sick, requirements that employers provide coverage or pay into a common pool, and so on. And now that many private insurers are hiking up premiums, co-pays, and deductibles, the public is even readier to embrace reform.