Under section 370 of the House Rules and Manual it has been held that a Member could:
• refer to the government as “something hated, something oppressive.”
• refer to the President as “using legislative or judicial pork.”
• refer to a Presidential message as a “disgrace to the country.”
• refer to unnamed officials as “our half-baked nitwits handling foreign affairs.”
Likewise, it has been held that a member could not:• call the President a “liar.”
• call the President a “hypocrite.”
• describe the President’s veto of a bill as “cowardly.”
• charge that the President has been “intellectually dishonest.”
• refer to the President as “giving aid and comfort to the enemy.”
• refer to alleged “sexual misconduct on the President’s part.”
Notice how conveniently the rules allowed seem to fit terms and words used towards George W. Bush. Meanwhile, any terms not allowed seem to fall in line with terms which might be considered fitting of Barack Obama or Bill Clinton.
See a complete version of "Rules For Radicals, Congressional Democrat Style," here.