Directly from Wisconsin's Senate Website:
Quote:
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Senate Rule 15. Roll call, quorum. Before proceeding to business, the roll of the members shall be called, and the names of those present and those absent shall be entered on the journal. A member present during any part of a roll call day shall be included in the official attendance roll call for that day. A majority of the membership presently serving must be present to constitute a quorum for the transaction of business; a smaller number, however, can adjourn and may compel the attendance of absent members. When a roll call discloses the lack of a quorum, further business may not be conducted until a quorum is obtained, but the members present may take measures to procure a quorum or may adjourn.
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http://nxt.legis.state.wi.us/nxt/gat...senate%20rules
So basically, this is NOT unheard of. The Republicans can choose to find the Democrats and "compel" them to attend the session OR adjourn.