"People will be better off with pre-existing conditions under our plan. That's the whole goal here."
Ryan is saying that people will be better off with preexisting conditions. People who actually have preexisting conditions (e.g., diabetes) would disagree, saying that they would rather not have them.
What Ryan meant to say is: "People with preexisting conditions will be better off with the GOP plan." That statement would be untrue, but at least it would make sense.
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Another example:
After bombing two of their churches on Palm Sunday, fearless Coptic Christians in Egypt poured to churches on Easter Sunday pic.twitter.com/AeY0IwoCAf— Issam Smeir (@issamsmeir) April 15, 2017
That is a truly atrocious dangling modifier. Please think about the actual meaning of what you write, folks, even (especially?) on Twitter. https://t.co/mpaRcVh41l— H.W. Fowler Style (@HenryWFowler) April 16, 2017