Why do the president, member of congress and fedral judges take an oath to defend the constiution of the united states?

Match the following items 1. formed by theodore roosevelt in 1912 2. republican president 3. a person who currently holds an office 4. democratic president 5. formed by ross perot in 1992 6. to yield or surrender; admit or acknowledge options; a. jimmy carter b. dwight d. eisenhower c. bull moose party d. united we stand party e. concede f. incumbent