Can we make voting for candidates and advocating for issues more social? And more specifically, can we make the whole process of supporting and endorsing candidates in advance of an election, or promoting a position on a bill, more transparent and sharable, in ways that get voters and activists to keep coming back to a website because it makes them more influential? That's the holy grail of a number of interesting startups, two of which--Votizen and DemDash--are getting a serious try-out next Tuesday around San Francisco's mayoral election. Votizen is better known, as it's already lined up some serious venture capital from investors like Ron Conway, Peter Thiel, and Sean Parker, and is getting usage by several mayoral candidates, including Ed...