Term: How many years the incumbent has been in office. There are only five incumbent Republicans on the list. Their names are in capital letters.

Tea: This denotes whether the republican candidate has Tea Party support.

McCain: Is a district one of the 48 that John McCain won.

08%: Is how the incumbent (almost always a Democrat) did in the last election. If the entry is '0' then this is an open seat.

Obama: The president's voting percentage from 2008 in that district.

PVI: This is the Cook Partisan Voting Index. A positive number means the district leans Republican. A negative number means it leans Democratic.

HCR: How the member voted on health care reform.

Stim: How the member voted on the stimulus bill.

C&T: How the member voted on "cap and trade" energy legislation.

For the true geeks among you, go to this page and you'll be able to manipulate the columns yourself.