SELECT "Open Cup" FROM table_70400 WHERE "Reg. Season" = '2nd, northeast'
What open cup did they play in when they finished 2nd, northeast in the reg. season?
CREATE TABLE table_70400 (
    "Year" real,
    "Division" text,
    "League" text,
    "Reg. Season" text,
    "Playoffs" text,
    "Open Cup" text
)