senators
The members of the senate is elected not by the people but by the state legislators each state has two senators making the total number of the senator 100.
legislators
legislators
They were chosen by state legislators
constituents
By being elected into office by their constituents.
The 17th amendment made it to where senators were elected by popular vote, not by state legislators.
The National Conference of State Legislators keep track of this and a lot more: http://www.ncsl.org/programs/legismgt/about/legislator_overview.htm
There is no legal requirement that elected legislators possess a law degree, or be attorneys.
State legislators are elected by the voters in their state districts. (This question was a garbled version of the related question below.)
legislators are elected from democratic or republican parties, senitors must be atleast 25 yrs representatives must be atleast 21 yrs.
Edmund Randolph on May 29, 1787