I think that Rep. Walsh will win the primary. Republican primaries are usually won by the most conservative candidate, and Walsh is more conservative than Hultgren.
He is and he may have the CFG's money but I don't see it happening. Add up these 'scandals' (democrat voters may not care if one of theirs has these issues but Republicans do) with that fact that Hultgren is an experienced, well known politician and the district is more Hultgren's territory and I'd be surprised if Walsh could win.