Their influence is debatable, but it's still interesting commentary...
Newspapers that have flipped party in 2012:
http://www.poynter.org/latest-news/...romney-latest-paper-to-flip-from-obama-in-08/
The bullshit of the article aside, I think it's very telling when an endorsement is "difficult to make".
Endorsements should be easy to make, because one should be endorsing the candidate one genuinely believes is the best person in the campaign for the office in question. Endorsing the best person should never be "difficult" - that is, unless you know and dislike him or her on a strictly personal basis, which is another topic.
If a person is making a "difficult" endorsement, that means he should be seriously rethinking his priorities. Either he is endorsing someone out of loyalty rather than the belief that that person is best for the office, or he is endorsing someone in spite of his loyalty to someone else. Either way, it is obvious the endorser has previously been operating on the basis of partisanship, rather than good sense and a real desire to do what is best for the nation.