The country has changed. Conservatives can not run the same sort of campaigns that they did in the past. At some point the Republican party is going to need to jettinson the hard right ideologues holding it captive on abortion/contraception, gays, race, immigration, tax policy, etc.
That process will be painful for the party but entertaining to watch and quite necessary. Just as Clinton turned the Democrats right to win elections someone will need to turn the Republicans slightly to the left.
There will be a lot of conservatives attacking Romney over the next few months (years?) but once they get that vitriol out of their system the smarter ones will sit down to analyze how and why they've lost 4 out of the last 6 presidential elections. This can only be good for the country.
I don't know, but I don't think if it was not because of charisma of Obama or Clinton these landslides would've happened. Republicans have constantly run on platform of hate and fear. In absence of democratic charisma they've done just fine. For instance Kerry couldn't bring enough voters to change the election in his favor. Granted Bush did a last minute campaign as well, still...
