I think they have not been his "brethren" for a long time. If you followed his trajectory, what happened at WPHT is that Smerconish was their anchor talent, tho his day job schedule only allowed him to broadcast the 6-9 AM slot. Then this minor syndicated guy from Tampa got picked up for 9-noon. He moved to Philly and did a mix of commentary, humor, satire, talk and quickly left Smerconish in the dust. That guy was Glenn Beck.
All of a sudden it was Beck who was the star. He got a TV show on CNN/Headline. He was picked up by Fox News and turned the dead zone 5 PM slot into a contender, leaving MSNBC in the dust. He got smart and branded himself with books - fiction and nonfiction - stage shows and public events, and people bought and attended. He was even nice enough to have Smerconish guest host for him on the CNN show a few times. Beck became a star while Smerconish, who was the conservative voice on 1210 was pretty much the local talent he had been years before. Smerconish tried to brand himself with a few books and a book club, but nothing really took off. As a conservative in a field of conservatives and libertarians - Beck, Rush, Hannity, Gallagher, Ingraham, Dennis Miller - he was small potatoes. And the current slot is not taking off, not because of PHT but because he is up against Rush, and in some markets Beck.
So there really was no place for Smerconish to go but to break left. He publicly supported Obama in '08 and that lost him a lot of the local audience. He started showing up on MSNBC. He recast himself as an "independent" but listen to any three of his shows and you know where he is - with the people who gave him the visibility and platform he wanted, and they were not conservatives.
As a host, he is okay. A little too much "me" - too many stories are brought back to what they have to do with him, what happened when he had a similar experience, etc etc.