Which parties have delegates in both the "Appropriations" committee and the "Economic Matters" committee?
select t2.party from election as t1 join party as t2 on t1.party = t2.party_id where t1.committee = "Appropriations" intersect select t2.party from election as t1 join party as t2 on t1.party = t2.party_id where t1.committee = "Economic Matters"