All of America was watching Barack Obama on Jan. 20 as he promised to “preserve, protect and defend the Constitution of the United States.” But few thought that, within a month, controversy would arise over the Constitution’s census clause.

“Representatives and direct taxes shall be apportioned among the several States which may be included within this Union, according to their respective Numbers,” reads Article I, Section 2 of the Constitution. “The actual Enumeration shall be made within three Years after the first Meeting of the Congress of the United States, and within every subsequent Term of ten years, in such Manner as they shall by Law direct.”

This was a revolutionary step. Censuses had been conducted since ancient times, as readers of the Gospels know. But the United States was the first nation to conduct a census at regular intervals. And it was the first nation to base legislative representation on population. Not many federal agencies perform functions specifically set out in the Constitution. The Bureau of the Census does.

Today, the census determines more than representation. It also determines the amount of federal funding for a vast array of programs. As a result, politicians have an incentive to try to maximize the numbers of their constituencies. On occasion, they have rejected results they have found distasteful. After the 1920 census showed an increasing proportion of urban dwellers, Congress refused to reapportion seats in the House of Representatives among the states.

But under prodding from President Herbert Hoover, a law was passed setting a formula for automatic reapportionment based on the census numbers starting in 1930 and continuing to this day.

You didn’t hear much about the census on the campaign trail. But controversy flared when Obama nominated Republican Sen. Judd Gregg to head the Department of Commerce, which has housed the Census Bureau since 1903. Almost immediately, there were protests from Congressional Black Caucus Chairwoman Barbara Lee (who cast the lone vote against military action in Afghanistan in 2001) and Hispanic groups. White House Press Secretary Robert Gibbs declared that the Census Bureau would report directly to the West Wing of the White House.

Gregg, perhaps miffed that a major function of the office for which he had been nominated would be taken over by Chief of Staff Rahm Emanuel, withdrew his name from consideration to be secretary. No new nominee has been named, but the issue remains: Will the politicians cook the numbers?

The black and Hispanic groups are concerned that blacks and Hispanics will not be fully counted. This is not a new issue. Census statisticians have known since the 1970s that there have been undercounts of people in neighborhoods with high crime rates or large numbers of illegal immigrants. Census Bureau professionals have worked to measure these undercounts and to minimize them by using official records and enlisting local volunteers to locate residents. Their efforts have had some success, as the undercount was lower in 2000 than in 1990.

Nonetheless, there have been demands that the Census numbers be adjusted by statistical sampling. The Supreme Court ruled in 1999 that sampling could not be used to apportion House districts among the states, but left open whether it could be used for other purposes. But after an intensive three-year study, Census professionals in 2003 said they could not guarantee that sampling would produce a more accurate count than the enumeration decreed by the Constitution.

As then-Census Director Louis Kincannon said, “Adjustment based on sampling didn’t produce improved figures.” Sampling might produce a more accurate number for large units but not for smaller units – just as the sampling error in public opinion polls is small for the total population but much larger for small subgroups. At the block level, sampling would result in imputing people who aren’t actually there.

The potential for political mischief, political overrepresentation and greater federal funding for favored groups is obvious, just as Congress’ refusal to reapportion after the 1920 Census resulted in political overrepresentation of low-growth rural areas and under-representation of then-booming big cities.

The better procedure is to trust the professionals at the Census Bureau. “I found the Census personnel to be among the most conscientious of any group I’d encountered in government service,” Bruce Chapman, census director in the Reagan administration, recently wrote.

“Whatever their personal political views (I suspect that most voted for Obama), their allegiance is to the integrity of the positions of public trust they hold.” This comports with my own observations of Census personnel over the years. Like other federal statistical agencies, the Census Bureau has a proud culture, developed and nurtured over many years and in many administrations, of independence from political manipulation and dedication to statistical rigor.

So it’s dismaying that the Obama White House, in response to political pressure, would consider overseeing the 2010 census. A better approach, endorsed by seven former Census directors and embodied in a bill sponsored by Rep. Carolyn Maloney, a New York Democrat, would be to set the Census Bureau apart as an independent agency. That would preserve, protect and defend the census that the framers of the Constitution took pains to establish.

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