CNN reports that Democrats are looking like winners for 2012.

According to a CNN/Opinion Research Corporation survey released Tuesday, the Democrats have a four-point margin over the Republicans in the battle for control of Congress. The poll indicates that 50 percent registered voters say if the election for Congress was held today, they would vote for the Democrat in their district, with 46 percent saying they would cast a ballot for the Republican in their district. The Democrats' four-point margin is within the poll's sampling error.

Gee, I wonder what happened?

Fun with polls, that's what happened.

Interviews with 1,034 adult Americans conducted by telephone by Opinion Research Corporation on April 29 - May 1, 2011. The margin of sampling error for results based on the total sample is plus or minus 3 percentage points. The sample also includes 964 interviews among registered voters (plus or minus 3 percentage points).

Notice anything?

Something missing?

Where's the demographic breakout? A lot of polls of late, all of them producing complimentary results for Democrats, unions or other clearly disfavored institutions, have been caught oversampling Democrats, Union households, or any other group guaranteed to push a poll in the right direction. This one dispenses with the normal breakouts of sex, age and political affiliation altogether.

Here's a reputable, weekly Congressional ballot poll. Republicans up by four, down eight points since the election. Democrats flat in the same time period. It seems clear that Democrats aren't in fact winning, but Republicans are losing--for being too much like Democrats.