Interesting. I'm getting a better handle on this. I do think there are many (I don't know the percentage) who are expecting him to stay on a conservative course, which is nothing more than wishful thinking. They'd be in for some serious disappointments if he won.
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I may be wrong about this, but I truly believe very little in the political spectrum that we argue about is firmly held belief.
How many times have we seen one side be firmly against something that just four years before, when their guy wanted it, they were rabidly in favor of...and vice versa.
Here's an example. The Dems were doves when Bush was in charge. Remember all that hubbub about the evils of nation building and deposing Saddam? But when their guy drew a red line that when crossed meant getting involved in Syria's civil war...suddenly they were fiercely arguing for it. And many Republicans were just as fiercely lobbying against it...not because they didn't want to see Assad deposed, but only because it made Obama look bad.
Securing the border and strictly limiting a path to citizenship for illegal aliens is different. Republicans, not Democrats, torpedoed Bush's push for amnesty based immigration reform. I think it is important enough for most to back off some less firmly held beliefs, like living wages for example.