Question: How many parties match the canididates listed as howard baker, sr. (r) 68.9% boyd w. cox (d) 31.1%?
Schema: create table table_1342149_42 (party varchar, candidates varchar, PRIMARY KEY (party))
SQL: select count(party) from table_1342149_42 where candidates = "howard baker, sr. (r) 68.9% boyd w. cox (d) 31.1%"