The conservatives are the Republican Party's base. Around election time you see how many Freepers stuff envelopes, walk the precincts, etc. There are many, many more conservatives in this country than the MSM would have you believe. Think Nascar nation--the most popular sport in this country is Nascar. Now how many of those fans do you think are panting to vote for Hillary? The most popular President of modern times by many orders of magnitude was Ronald Reagan, an unabashed conservative who ran as a conservative and governed as a conservative.
If the Republicans run another Reagan, an ideological conservative, and optimist who can get that message to the people, there isn't a Democrat on earth who can stop him.