And what impact would that pick have on his 2013 re-election run and any possible 2016 bid?
CNN: Lautenberg leaves tricky political question for Christie
The next general election in the Garden State is in November, when Christie is up for re-election.
CNN: Lautenberg leaves tricky political question for Christie
Meanwhile, Ahmadinejad has been campaigning for re-election since Day One of his presidency in 2005.
CNN: Top Iranian reformer to challenge Ahmadinejad, reports say
Most obviously, a sputtering economy spells difficulties for President Obama in making his case for re-election.
Shareholders opposed the re-election of chairman Sir John Bond at the company's first annual general meeting.
Deputies Mike Garrett and Sean McManus also failed to win re-election in the Castel electoral district.
BBC: Guernsey's Deputy Chief Minister fails to get re-elected
Georgia's Democratic governor, Roy Barnes, who hopes for re-election in November, has other plans.
ECONOMIST: Forget buses and trains; just build more highways, dammit
That's why the African-American turnout for the president's re-election was higher than the white turnout.
Since Mr Putin's re-election last March, legal action against opposition figures has increased markedly.
No one thinks the burglary at the Watergate office complex was necessary for his re-election.
The last two incumbents not to win re-election, Jimmy Carter in 1980 and George H.
Pluralities of Ohio and Florida independents report that Obama's re-election would hurt their personal financial situation.
Since Mr Putin's re-election in March 2011, legal action against opposition figures has increased markedly.
Even some of those who didn't support Obama's November re-election turned out to watch.
He was defeated by Democrat Bill Clinton when he stood for re-election in 1992.
He won a short-term special election in 1970 and has easily won re-election ever since.
To justify his re-election, Mr Bush does not have to be perfect merely better than Mr Kerry.
Re-election has come and gone, and Mr Clinton has still not liberalised border trucking.
Brian Bilbray, Steven Kuykendall and James Rogan, who are all facing tough re-election campaigns.
If Rogan doesn't seek re-election, Republicans lose the advantage of incumbency in the district.
He will not run for re-election as party chairman at a convention in May.
ECONOMIST: Will the new face for the Free Democrats be tough enough?
When Obama needed a re-election boost last year, Bill Clinton was there to help.
The seat became available when Republican incumbent Pat Toomey chose not to seek re-election.
Coleman, who faces a tough re-election bid this year, insists he's being unfairly targeted.
Lincoln won re-election in 1864, as Union military triumphs heralded an end to the war.
There are more vulnerable Democrats than Republicans up for re-election, especially in the Senate.
Nagin, first elected in 2002, was supposed to come up for re-election next month.
Matt Blunt, the Republican governor, announced in January that he would not seek re-election.
ECONOMIST: Gubernatorial candidates are waging their own battles
Fillon disputed this and the pair eventually agreed to a re-election later this year.
Chavez, who ruled Venezuela for 14 years, celebrated a triumphant re-election victory in October.
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