"Did you vote for Ronald Reagan? Clinton? Kerry?"
Worked his campaign. No. No.
"Yeah but from reading your profile page, you actually believe the Democrat Party is in a position to do so, a party that Mr. Reagan realized even back in 1964 has sold it's soul to cultural Marxism."
The Democratic party exists to get it's members elected to political office. If the Democratic party thinks that by adopting conservatism it will achieve that goal, it will adopt it. The Democratic party is the more populist of the two parties.
That said, I don't see the Democratic party adopting conservatism on a nationwide basis at this point because conservatism's popularity is limited to certain areas of the country. Generally rural areas, the south and some parts of the west. Conservatives don't win in Massachusetts because conservatism isn't all that popular there. However, were that dynamic to change, the Democratic party would eventually adapt to reflect it.
"That is so outrageous to strain credulity."
Counterintuitive, yes. Outrageous, no. The Democratic party has been relatively quick to adapt to changing political realities. Take a look at the history of the early 20th century if you want an example.
"You'd be better off to begin a third party than to think the Democrats will ever make any meaningful overtures to the right."
Third parties are a nonstarter. Restrictive ballot access laws and campaign finance "reform" have made certain of that. If Ross Perot with his billions couldn't make a go of it before CFR, I doubt that anyone else could now. The menu choices for the foreseeable future are R and D, with no substitutions.