quote from the following link:

http://dictionary.reference.com/browse/Vote

vote
c.1460, from L. votum "a vow, wish, promise, dedication," noun use of neut. of votus, pp. of vovere "to promise, dedicate" (see vow). The verb in the modern sense is attested from 1552; earlier it meant "to vow" to do something (1533).