Via Matt Yglesias, a somewhat obvious, and interesting explanation for Hillary outperforming her poll numbers: She picked up most of Joe Biden and Chris Dodd’s supporters.

But while that may have occurred, that doesn’t quite explain what happened in these polls.

The CBS poll didn’t list Biden or Dodd as options, and no ”likely Democratic primary voter” volunteered them. That poll had Obama winning by 7 percent.

Marist had Obama by 8, and they didn’t list Biden or Dodd. Less than 1 percent said “other,” and only 4 percent were undecided.

UNH had Obama by 9, didn’t list Biden or Dodd, and 1 percent “other” and 6 percent “undecided.”

Ditto for Rasmussen, Obama by 7, no Biden or Dodd, and undecideds not listed.

Zogby had Obama by 13, didn’t list the two dropouts, and had only 5 percent undecided.

In Suffolk, no respondents volunteered Biden or Dodd.

Finally, ARG dropped Biden and Dodd as well, and had only 2 percent undecided. They had Obama ahead by 9 percent.