CREATE TABLE table_21531764_2 (lower_house_majority VARCHAR, senior_us_senator VARCHAR)

What's the lower house majority in the state whose Senior senator is J. Shaheen?
SELECT lower_house_majority FROM table_21531764_2 WHERE senior_us_senator = "J. Shaheen"
SELECT "lower_house_majority" FROM "table_21531764_2" WHERE "J. Shaheen" = "senior_us_senator"