The Democratic Congressional Campaign Committee is baffling fellow Democrats by pouring money into yet another competitive House primary — this time in Arizona. Why it matters: The DCCC has racked up a spotty record in its attempts to intervene in Democratic primaries this cycle, leading some House Democrats to question why they're paying dues to the campaign committee. Rep. Adelita Grijalva (D-Ariz.), who previously criticized the DCCC for intervening in California, told Axios she is "frustrat