Boston is known as a city where patronage and politics travel hand in hand, but still, many in the Hub’s arts community were surprised and bemused when longtime Mayor Tom Menino appointed a political ally with no arts experience to head Boston’s Office of Arts, Tourism, and Special Events. But some say that, in a city like Boston, what the arts community really needs is an advocate who knows the area’s political labyrinth inside out, and can negotiate from a position of strength.