Here is what Sen. Coburn wrote about John McCain in National Review Online after last year’s immigration bill train wreck:
The rest of the piece is worth reading. It’s similar to the arguments we at the New Hampshire Union Leader made in endorsing McCain despite, not because of, his positions that irritate conservatives, including us.
I think our endorsement helped him win New Hampshire because it gave him a sort of conservative seal off approval here. Coburn’s endorsement might have a similar effect, as far as endorsements from U.S. senators go. Coburn has a lifetime ACU rating of 97.8 and he is no friend of the Washington establishment. That he picked McCain over Romney says a lot, I think.