Obviously true.
Can do it on most issues too...
They'd garner more respect if they weren't always lying, twisting the truth to serve their ends. They're just not serious people; no one can seriously make the case the country hasn't shifted much further left than where it was.
No one, at least, who pays attention and is capable of giving a competent, honest assessment like that Economist article I linked (which is a left of center publication except for some of their coverage on actual economics), all would be forced to admit the same conclusion: American politics have gone too far left for the American people, who are center right and haven't changed much at all except to the left on these stupid social issues in my lifetime.