Yes, there is a precedent for legislators fleeing across state lines

Matt Mitchell pointed out to me that the actions of Wisconsin’s 14 legislators – fleeing across state lines to avoid a quorom – quorum does have a precedent.

In 2003, 51 Texas Democratic legislators fled to Oklahoma to kill a Republican re-districting plan.

Other famous quorum-dodging incidents:

In 1988, Senator Bob Packwood (R-Ore.)who tried to escape a quorum by barricading himself in his office was forcibly dragged by the Sergeant-at-Arms onto the floor of Congress. An event that occurred with another member of Congress 46 years earlier.