What is an elected second chamber? Watch
[Second Chamber is] the house in a bicameral legislature that is inferior in status and powers on the ground of constitutional prescription, of custom, or of the locus of responsibility of the ministry, is often orig. designed as a check on the other house, and is often constituted on a different basis (as heredity) from election.
- More 'checks and balances' lead to less power to one institution.
- Extra check improves quality of laws. Flaws are more likely to be noticed and corrected.
- Extra chamber -> longer duration of legislative process -> slower reaction time of government to changes in society.
An elected second chamber means all the members of the chamber have won elections in their constituencies (areas/states etc.) and thus have been voted in by the general public (you and i)
An elected chamber is more likely to be representative of the people. (In theory anyway, but if you look at the UK's first past the post system significant minorities can be left out)