Polls closed in Connecticut at 8 p.m. as voters cast ballots in the state's primary elections Tuesday.
The Associated Press delcared Linda McMahon the winner of the GOP Senate race over Chris Shays about 40 minutes after the polls closed.
Moments later, the Associated Press declared Chris Murphy the winner over Susan Bysiewicz in the Democratic race for Senate.
Elections officials said turnout appears to be on track to hit 25 percent to 30 percent as Republicans and Democrats picked their candidates for the November general election.
Hotly contested races for the U.S. Senate and House of Representatives dominate Tuesday's ballots.
Many polling places saw a slow stream of voters.
Secretary of the State's office spokesman Av Harris said turnout was 7 to 8 percent in the morning and no major problems were reported.
On the Democratic Senate side, Congressman Chris Murphy is up against former Secretary of the State Susan Bysiewicz.
There are three Democrats and four Republicans vying for Murphy's 5th District seat.
Chris Donovan, Elizabeth Esty and Dan Roberti are vying for the Democratic spot on the November ballot in the 5th District. Donovan, who is House Speaker in the General Assembly, has the party's endorsement but has faced harsh criticism from his opponents after arrests of some of his campaign staff on corruption charges.
On the GOP side, Mark Greenberg, Lisa Wilson-Foley, Justin Bernier and Andrew Roraback are squaring off for a chance to move on to the November election.