During an appearance on MSNBC, columnist Jennifer Rubin — a conservative until Donald Trump came along — pointed to the former president’s latest “inanities” delivered in rally speeches and went so far as to call the presumptive GOP presidential nominee a “crackpot.” Speaking with host Ali Velshi, the opinion columnist was asked, “You just published a piece for the Washington Post this morning, titled ‘Four ways Biden can make inroads with anti-Trump Republicans.’ Talk to me about those.” “There are millions of Republicans out there who supported Nikki Haley and understood her message that Tru…