If Coons wins, he won't be up for reelection until 2016. Senators serve six-year terms.
No. This election is to fill out the remainder of Biden's unexpired term, to which he was elected (over O'Donnell, in a landslide) in 2008.
An appointee filled the seat until the next general election, this year ... leaving 4 more years in the term.
So this seat is next up for election in 2014.
Nope, not in this case. This is a short term, the seat that Biden won. 2014.