This certainly depends on the individual, but for me, I start with intellectual objections to government power -- and to the implicit acceptance of massive gove

This certainly depends on the individual, but for me, I start with intellectual objections to government power -- and to the implicit acceptance of massive government power found in American liberalism -- and the long record of "Progressive" programs failing to meet their goals and producing instead negative consequences. An example of both of these is Social Security. It is easy to be contemptuous of most liberal opinions (though this is not sufficient to be opposed to Progressive ideals) as they ignore the disconnect between intention and effect. Many progressive programs are righteous in intention, but harmful in effect. An example is the minimum wage. I sympathize with OP's position. I too voted for Obama and I now have "liberal" friends making increasingly hair-brained excuses for these mad abuses of civil liberties. They love Obama the man more than they care about his rule.