Senate Democrats will have smaller majority in lame-duck sesssion

Kirk captured the Senate seat that belonged to President Obama. He won a special election to serve out the final weeks of Obama’s first term as well as an election to serve a subsequent six-year stint.

Manchin was elected to complete the term of the late-Sen. Robert Byrd (D-W.Va.), who was re-elected a record ninth time in 2006.

Coons will fulfill the remaining four years of former Sen. Joe BidenJoe BidenBiden to make first WHCD appearance: report If you’re going to meet with Merrick Garland Biden on cancer research: 'I’ve been on the other end of the need' MORE’s (D-Del.) seventh term. Biden left the Senate in 2009 to become Barack ObamaBarack ObamaGarland confirmation vital to fair consideration of SCOTUS cases Davis: Two cheers for Bernie Sanders GOP urged to confirm Supreme Court nominee after Trump win MORE’s vice president.

Kirk will give Republicans control of 42 seats during the lame-duck session, meaning that Democrats will now have to win over at least two GOP votes to pass end-of-year agenda items.

The practical impact may be minimal because Republican senators have balked at making solo defections on tough votes. Throughout the 111th Congress, Senate Majority Leader Harry ReidHarry ReidMellman: Give positive a chance Koch network super-PAC launches ad buys in Wisconsin, Nevada Trump: 'I'd have to think about' Cruz for Supreme Court MORE (D-Nev.) has had to persuade small groups of centrist Republicans to cross the aisle to pass jobs legislation and extensions of unemployment insurance.

Manchin may prove to be a tougher vote for Democratic leaders to corral than Sen. Carte Goodwin (D-W.Va.), whom he picked to fill in for Byrd temporarily.

Manchin ran as an outspoken opponent of President Obama’s agenda and went so far as to fire a bullet into a copy of energy reform and climate legislation in a television ad. He also vowed to cut federal spending and repeal what he called the “bad parts of Obamacare.”

Democrats have a list of legislation they want to pass in the lame duck.

They must vote on an extension of the 2001 and 2003 tax cuts passed under President George W. Bush, which expire at the end of the year. They must also consider an omnibus appropriations bill or a stop-gap funding measure to keep government funded beyond Dec. 3.

They may also look to extend unemployment benefits, which expire at the end of this month, and freeze a scheduled cut in doctors’ Medicare reimbursements.