Varying at times, but its usually a lower number and for the time I would say 13. (June 04, 2009)
In each two year election cycle one-third of the United States Senate is up for re-election as each Senator serves a six year term. In the United States in 2012 23 Democratic seats were up for election and 10 Republican seats. (seats either held by a Democrat or Republican) The Democrats won all of their seats back and turned two Republican seats into Democratic seats. Two other seats were won by Independents; one of them previously a Republican seat. There are now 55 Democratic seats and 45 Republican seats in the United States Senate as the two Independents are caucusing with the Democrats.
I believe it is 101 seats.
There are 100 Senate seats, two from each State
We have approximately 59 senators in Illinois.
3 house seats and 2 senate seats but the election in 2012 will drop from 17 to 16 so house and senate seats will be cut back
76
2
60
The Arkansas Senate has 35 members.
Three
435
The U.S. does not have a Parliament but has a Senate with 50 seats and a House of Representatives which has 435 seats.