Incumbents facing 2010 primaries?

By Fester:

I like primaries.  I think they are an important accountability and responsiveness mechanism.  And right now it looks like 2010 will see an unusual number of incumbents facing the possibility of serious primary challenges.  I'm trying to figure out who else should be on the following chart of serious primary challenges:

Incumbent	Chamber	Part	District	Reason	Likelihood
Burris	Senate	Dem	Illinois	anti-douchebaggery	certain
Boyd	House	Dem	FL-2	ideological	certain
Gillibriand	Senate	Dem	New York	misfit for state	highly likely
Cooper	House	Dem	TN-5	ideological	likely
Specter	Senate	GOP	Pennsylvania	ideological	rumored
Bennet	Senate	Dem	Colorado	opportunity	rumored
Rangel	House	Dem	NY	ethics	unlikely

Who am I missing, especially on the GOP side of the equation?