As of July 2013, there are 52 Democratic Senators and 2 Independents that caucus with the Democrats.
There are 53 US senators that are democrat (Washington Post, 11-5-2010).
49 as of 2007.
100
100. Two from each state. 60 democrats, 40 republicans.
100
100
50
100
100
There are 2 Senators from each State, so there are 100 Senators in total.
2 per state, or 100.
Whatever the number is, they now have it.
Each state has 2 Senators, and some number of representatives based on population.