Bruce Bartlett worked on the Congressional staffs of Ron Paul and Jack Kemp and served in senior positions in the administrations of Ronald Reagan and George H.W. Bush. In addition, he is a friend of Grover Norquist, the contemporary Darth Vader of increasing taxes. He has written a book, The Benefit and The Burden, and discusses his views on both tax policy and the current political environment in this clip from John Stewart.
Tom Noonan 
According to the Americans for Tax Reform (ATR), the Taxpayer Protection Pledge solemnly binds those who sign it to oppose any and all tax increases. No exceptions are permitted regardless of circumstances. According to the ATR, in the unfortunate event of a real crisis (war?) or natural disaster, the legislator should propose spending cuts in other areas to finance the emergency response rather than raise taxes. (atr.org) Lawmakers who sign this Pledge appear to be violating Rule 6 of the Code of Ethics for Government Service which states “Make no private promises of any kind binding upon the duties of office…” Read about the Code of Ethics for Government Service at Pages 20 and 436 of the Ethics Manuals for the House and Senate, respectively, at ethics.house.gov and ethics.senate.gov.