They are not able to urge opposite positions within the other house. Action of the two houses required for passage prevents bills from being quickly passed under the sway of emotion. Many of the charges of shifting responsibility are exaggerated and ill-founded. A legislator who continually fails to accept responsibility would not be reelected. Objectionable lobbying is not hte major problem in the bicameral legislature that it is often assumed to be.
Lobbyists can more easily promote desired legislation where control is needed in only one house.
Although bicameral state legislatures are not perfect, it would be easier to correct their flaws than to change their structure. Further consideration of legislation by a duly-elected body would assure more thoughtful action in passing bills. National Municipal Review . Bigelow, Elizabeth, ed. Essays on Unicameralism .