“But I’ve thought this open primary situation might make him unbeatable. The Dims know they are very unlikely to elect a Dim in SC now, so they crossover and vote for Lindsey and get pretty close on many issues.”
The dems could very well win the seat with the guy that just announced (see below story). I’m hoping this will keep democrats within their own primary, forcing a runoff on the republican side.
http://www.thestate.com/2014/03/28/3354191/brad-hutto-files-to-run-for-us.html
Maybe it will, but there would need to be a competitive primary race on the Dim side to really keep them in their own primary. - And there are probably also scenarios where a good conservative running as an independent could defeat Graham: strong Dim candidate, Lindsey and a strong conservative running as an independent in the general election.
And it's also a question of how great the anti-Lindsey sentiment among Republican voters has become.