Never forget that Ronald Reagan once cheered Socialism, and you might say he had been a "useful fool." The Apostle Paul was once Christianity's greatest persecutor, but became its greatest writer and discipler. Converts to Truth should always be welcome, not scorned and rejected.
As the French scholar Antonin G. Sertillanges wisely admonished in his 1934 book The Intellectual Life, "Train yourself to indifference about sources. Truth alone has a claim, and it has that claim wherever it appears."
OK, which one is going to convert, Maher or Obama?