What are the names of parties that have both delegates on "Appropriations" committee and "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"