Nancy Pelosi speaks about the discharge petition on the House floor.

There are now 178 signatures on the Democrats' discharge petition to force a House vote on extending the middle class tax cuts. Rep. Tim Walz filed the petition on Tuesday and the signatories started piling on.

Signers are so far all Democrats, but the petition is intended to put pressure on those Republicans who say they want to vote on middle class tax cuts and get that bit of fiscal cliff curb negotiating off the table. Here's a chance for them to make that happen.

We're doing our part to help. Use this tool to email your representative, asking them to sign the petition, or, if they've already signed, to send your thanks.