@cicerone imposter,
In a perfect world, you're right. In the real world, if someone has a close association with someone, unless they go to lengths to distance themselves, they are lumped together. The problem with the GOP trying to tie Hillary to Bill is that Bill is probably the most popular politician in the country, that's why the Democrats feature him so prominently during their conventions. Bill Clinton is a powerful campaign weapon for the Democrats.
Among committed Republicans, Bill's name is mud, but they aren't voting Democratic under any circumstances, so from the viewpoint of the Democrats winning the election, who cares?