A senator does not have to be democrat he or she can be of whatever party he or she wants.
There are currently 57 Democratic Senators.
yes both of them were
As of July 2013, there are 52 Democratic Senators and 2 Independents that caucus with the Democrats.
51 Democrat, 47 Republican, 2 independent (they vote with the Democrats)
Both are Democrats.
As of 2010, there are 100 Senators in the US Congress.
Since 2006 49 are democrats 49 are republican 2 are independents
Frank Lautenberg and Bob Menendez. Both are Democrats.
Senators Clinton and Obama.
Both senators are democrats.
As of the 2012 election, there are 53 Democratic Senators, plus 2 independents who caucus with the Democrats. There are 45 Republicans.
Russ Feingold and Herb Kohl, both Democrats.