Sure you can ignore a subpoena - then the judge can issue either a summons - a court order for you to appear or the grand jury can issue a subpoena instanter. The instanter tells the serving authority to bring you back "right now".
Most regular subpoenas have a boundry of authority - that is a subpoena issued in one state has no enforcible effect in another state.
...CONDIT is fighting his Judicial Subpoena based on the Congress' Seperation of Powers Protections for its Members.
...CONDIT's very expensive Defense Attorney ABBY LOWELL tells America's Media ONE MONTH AGO that CONDIT will comply...
...and then he DOESN'T.