The Legion election has its own page at the DC site, open now through Nov. 10th. You have 25 candidates to choose from (including Chameleon Girl, Earth-Man, and Gates, but not including Matter-Eater Lad), with no write-ins. Apparently you're limited to one vote per IP address.
By the order of the LEGION OF SUPER-HEROES CONSTITUTION, a Legion leader will be chosen in a manner determined by its membership. Please review the following list of active members for the Legionnaire that you feel embodies the traits and skills of a strong leader. Remember Legion Constitutional Amendment to Section 8.0: Anyone attempting to use their superpowers to influence the election may be exiled to Shanghalla and their votes discarded!
Computo will tally the votes between the polling period of OCTOBER 20 and NOVEMBER 10.
I voted for Gates, just to see what Paul Levitz would do with him.
And incidentally, section 8.0 of the Legion Constitution really does cover voting. The new leader is the one with a plurality of the votes, with the deputy leader the one with the next highest number of votes.