Split between what candidates? We will be fortunate to have A conservative with any $ by the time the primaries roll around since there are virtually none in the running except 3rd tier candidates. It's much more likely that Rudy will split the vote with 2 other lefties (McCain and Romney) if he runs.
Sen. McCain, Sen. Brownback, and Rep. Hunter are conservative, and ex-Rep. Gingrich will probably run. The conservative vote will probably split among those four.