I'd never endorse Hillary Clinton, never vote for her (I'd rather vote for a third party because that wouldn't give her the appearance of having momentum), but a John McCain presidency would pretty much be the end of conservatives in the GOP as we know it, particularly with McCain already showing his willingness to micromanage the political parties. McCain will get more Democratic Congresses, which will mean liberal legislation by the ton. McCain works well with Democrats (to pass their agenda.) Name one Conservative thing he's worked with Democrats to accomplishment. It would depress the GOP base and lead a near permenent Democratic Majority on the hill. A McCain presidency would be similar to an Eisenhower presidency (another guy who didn't care much about the party base.)
When Ike came to power, Republicans had 221 House Seats and 48 Senate Seats. When he left the GOP had only 174 House Seats and and 37 Senate seats. That's the historical precedent of having a President who doesn't care about the party base.
On the other hand, if Obama is elected (in particular), it'll mean a lot of people will die. Hillary is far more competent than he, but remember the last Clinton Administration gave us Gorelick's "Wall" which led to 9/11. So thus the choice, "Vote Republican or people die." Vote for what you fear rather than what you love. Praise Emperor McCain and pass the barf bag.
Having suffered through eight years of the Clintons’ sleaze, I do not want a repeat of the sex offender back demeaning our White House. With John McCain & Cindy, we would get more sleaze plus a mentally ill president. While Obama (as far as I know) has not committed rape or adultery and has a normal family life, he is equally bad for the country.