First, I'm not glad to see Bennett go. I believe he was the the type of politician who approached issues with reason and logic, and was able to find room in his heart for compromise and civility.
Second, I think it was the wrong decision. The two candidates that the Utah State Convention chose over Bennett both appear to have impressive resumes, but both of them are far too willing to pander to the Hannity/Palin/Beck-ified Utah conservative base on issues like immigration and health care. The fact that the Republican Party no longer has room for Bennett, makes me wonder if the GOP's may no longer have room for moderate points of view. I'll admit that some life experiences have made me lean a bit more to the left than I have in the past, but the ever increasing degree for which some "Republican's" embrace fear-mongers like Beck, Hannity, and Palin has made me move even closer to joining the Democrats (unfortunately, that party is just as screwed up and direction-less -- with less fear, but more anger)
Mike Lee's campaign immigration platform is ridiculous and, quite frankly, I don't believe he plans on truly pursuing a single word of it if elected. Lee gets the need for congressional term limits, but term limits are/were in his best interest -- so I don't feel like any great credit should be granted for that position. The flat tax is a bad idea (a subject that I written on repeatedly if you care to search my archives) that multiple other Senators have pursued and failed at achieving before, and I anticipate that Mike Lee will pursue it and fail to get support for it as well.
Tim Bridgewater hasn't tried to position himself as far to the right as Lee, and I think it will serve him well in the long-run. Unfortunately, Tim Bridgewater has some credibility issues due to recent revelations of his past business dealings he either sought for Federal Government earmarks for his business enterprises and the enterprises of clients that he advised, and I'll have hard time accepting his assertions of keeping a iron clamp on the Federal purse-strings when he has made a living helping entrepreneurs seek/attain Federal Funds for business purposes. However, despite his continued use of the phrase anchor baby on his campaign website, I think Tim Bridgewater has the most well reasoned approach to illegal immigration of the two Republican candidates.
I actually think that the biggest thing that the Republican convention succeeded at in ousting Bennett is offering Utah Democrats their best opportunity at a Senate seat in decades. If Granato can position himself as a Jim Mathesonian moderate Democrat, than he stands a good chance at winning the Senate seat.