GOP nominee Christine O’Donnell is clearly one extremely flawed candidate, and her upset win in the Republican primary helped all but guarantee that Democrats will keep control of this open Senate seat. Two new polls have Democrat Chris Coons leading by double digits.

The lesson of Christine O’Donnell’s primary win in Delaware may be this: In politics you don’t elected officials to agree with you, just too afraid to vote against you.

The Tea Party triumph of Christine O’Donnell in a small pool of conservatives in Delaware over moderate Mike Castle has led the bulk of the Republican Party to run screaming in the other direction while the first set of post-primary polling shows Democrat Chris Coons up big.

Tonight is the last big primary night of the cycle featuring several important races. Voters in Delaware, District of Columbia, Maryland, New Hampshire, New York, Rhode Island and Wisconsin are all deciding their parties’ nominees. You can find a preview of what races are worth watching this evening here. You can find part one of the liveblog election results here. You can find live election results at Politico.

Staunch conservative Christine O’Donnell is challenging Rep. Mike Castle (R-DE at large) for the Republican nomination for the Delaware Senate seat formerly held by Joe Biden. Despite Castle being the establishment choice with a good chance of winning in a blue state, O’Donnell has lined up impressive endorsements from powerful conservative organizations, including the Susan B. Anthony List, Tea Party Express and Concerned Women for America. Seeing conservatives wrestle with which candidate is the best choice for advancing their policy goals is a great way for the progressive community to understand the policy and economics of primary challenges.