From NUMBER@1 to NUMBER@2 PERSON@1 was the leader of the ORGANIZATION@1 Democrats , serving as ORGANIZATION@1 Majority Leader from NUMBER@1 to NUMBER@3 and NUMBER@4 to NUMBER@2 and as ORGANIZATION@1 Minority Leader from NUMBER@3 to NUMBER@4 .

He served as majority leader from NUMBER@1 to NUMBER@3 and again from NUMBER@4 to NUMBER@2 .
