Kamala Harris was not President Joe Biden’s first choice as his running mate, according to a new book. Biden allegedly thought she “was not up to the job,” but President Barack Obama was said to have encouraged the 81-year-old to choose Harris. The current sitting president allegedly preferred Michigan Governor Gretchen Whitmer as his running mate in 2020, however, he reportedly caved to public pressure. Veteran Washington journalist Charlie Spiering made the stunning revelation in his latest book, Amateur Hour: Kamala Harris in the White House. In the book, he wrote Biden chose Harris days be…