For the record, an impeachment of a sitting official of the executive branch requires a simple majority vote in the House of Representatives in order to pass up to the Senate for trial.

The problem is, the impeachment document has first to be drawn up. That is the greater stumbling block to impeachment with this Congress.

Hence Feingold's censure resolution. Feingold doesn't need the support of the Democratic leadership (which he likely wouldn't get, unless the polls show overwhelming support for it among Dem and The Big Business Party voters) to get the resolution discussed in the court of public opinion.