Josh Perry is a lanky, 26-year-old from Nederland, Texas with a good job on Capitol Hill and a healthy adoration for Taylor Swift. And every day, he pretends to be Ted Cruz on the Internet. As Cruz's in-house digital strategist, it is Perry's job to channel the freshman senator online, engage activists on Twitter and Facebook and promote Cruz's media appearances and speeches. In just a few years, Cruz gone from working as the state Solicitor General and as a corporate attorney to become one of the most talked-about politicians on the Web. Cruz began traveling to Iowa and New...