I think to be in politics you have to have the taste for blood on that.

The line suggests a bleak, almost predatory view of political life: to participate successfully, one must be comfortable with conflict, reputational harm, and the willingness to “draw blood” (metaphorically) through hard-edged tactics. “Taste for blood” implies not just tolerance but an appetite for the adversarial, zero-sum aspects of power—attacking opponents, enduring attacks, and making decisions that can hurt others. The phrasing also hints at moral unease: politics is portrayed less as civic service than as a brutal arena that rewards those who can stomach (or enjoy) its cruelty.