[Gipper08]

"Brownback,"
Immigration makes him a non starter.
Voted for NCLB and Medicare
etc

"Pawlenty"
He is not a movement conservative and does not have the support of conservatives in his own state.
He is too pro-big education
Broke his no new tax pledge
etc

[JohnnyZ]

Sam Brownback has been a trusted conservative for years. People who hate immigrants won't vote for him, but people who want to reform immigration will.

Tim Pawlenty has a great track record as governor, pushing through conservative legislation in a state traditionally run by liberals. He got 95% of what he wanted in the budget even when the Rats forced a government shutdown. He's been a very good fiscal and social conservative, with some populist initiatives on peripheral issues. Next best thing to Jeb governor-wise.